Hueco Mundo Happenings timeline.

Jan 1, 1378

Natural arrancar wandering on their own include all canon privaron and Neliel Tu (sans fraccion), plus several others
Apr 21, 1385

Natural arrancar in the area congregate, build crude but passable palace, try to bring civilization to the area
Apr 21, 1388

Barragan arrives with posse, takes over, drives off natural arrancar; Las Noches in ruins
Period: Apr 22, 1388 to Apr 22, 1417

Barragan rules Las Noches
Apr 21, 1397

SA: Lives in region of the wilds known as the acid waste (parted ways with Ilforte long ago when the older left for gentler climes)
Apr 21, 1397

Grimmjow stalks about, pre-posse
Jun 21, 1397

H: Moves into new territory, is hounded by Barragan and others
Apr 21, 1402

Aizen locates/studies natural arrancar scattered far and wide over Hueco Mundo, starts keeping tabs on them
Apr 21, 1408

SA: Forms close alliance with Fornicaras
Apr 21, 1408

Aizen adds powerful, interesting, or unique hollow to his “stalk” list, hoping to follow their progress and make use of them later
Apr 21, 1417

Aizen overthrows Barragan and rules in absentia; Barragan pretends nothing happened, rebuilds his army [AU: NOTE 1]
Apr 21, 1418

Aizen begins assembling natural arrancar (signing them up, but leaving them in their natural habitats)
Apr 21, 1425

SA: Merges with Fornicaras with surprising success; SAF find that their area cannot support their stronger self and migrate
Apr 21, 1433

H: Comes to Mila Rose’s aid and determines that she will try a new tactic when combating the males in her new territory
Feb 21, 1438

H: Invites Sung-Sun to join her little group
Apr 21, 1440

Grimmjow's posse gathers, Ilforte and Shawlong vie for leadership
Apr 21, 1441

H: Rescues Apacci, flashback contents up until Barragan’s threat; the four ladies migrate elsewhere rather than fight
Apr 21, 1442

Grimmjow’s posse attacks him, makes him king; they keep to the edges of Las Noches
Apr 21, 1443

SAF: Settle into well-defined territory; tend toward brutal ambush followed by experimentation on / consumption of prey items
Apr 21, 1448

Grimmjow and posse part ways, om-nom-nom
Apr 21, 1452

Aizen recalls natural arrancar to Las Noches under Barragan's regency; Barragan under surveillance to keep the peace
Apr 21, 1455

Aizen approaches Grimmjow’s posse, makes Shawlong an arrancar (11), recruits Grimmjow (12), makes the rest (13 etc.)
Apr 21, 1456

Zommari is recruited and made an arrancar
Apr 21, 1457

Barragan remade (as primera); beginning of espada ranking system

Espada: Barragain, Unknown, Neliel Tu, Cirucci, Dordonii, Gantenbain, Grimmjow, Zommari, Unknown, Luppi
Apr 21, 1458

Imanol arrives, is remade, overthrows Unknown to become 2nd espada
Apr 21, 1463

Aizen recruits Tousen Kaname, begins work on his theory of how to break masks to mimic the natural arrancarization process
Apr 21, 1468

Aizen and Co. make arrancar of assorted powerful hollow they come across, but leave them in their habitats as advertisements
Apr 21, 1471

Aizen approaches SAF, describes a lab environment, offers one; they consider, but have vanished by the time Aizen returns
Apr 21, 1476

Imanol and Neliel Tu take on followers from among the numeros, these become the first fraccion
Apr 21, 1478

SAF: Some incident or other in their new location that prompts them to reconsider Aizen’s offer (positive, negative, or neutral)
Apr 21, 1478

Aaroniero (AA) is made into an arrancar, and takes the 10th rank [AU: NOTE 2]
Apr 21, 1479

Aizen locates Harribel and posse, pulls strings so they are pressured to move back to the Las Noches area; they persevere where they are
Apr 21, 1482

Espada: Barragan, Imanol, Neliel Tu, Cirucci, Dordonii, Gantenbain, Grimmjow, Zommari, Szayel Aporro, Aaroniero
Apr 21, 1483

SAF: Shows up at Las Noches, is made an arrancar (w/ odd split), ranks 9th by trickery alone—surprising /everyone/ (esp. Ilforte)
Apr 29, 1483

SAF: Tensions between SAF and Ilforte pick up again almost immediately, escalate rapidly, and are quite public
Apr 21, 1484

Aizen sets aside lab area in Las Noches; SAF’s tasks: improved garganta, dome blueprints, streamlined arrancarization process
May 21, 1484

SAF: Have dispute with Imanol in hallway (Imanol is angry that the “lab” is bigger than his suite of rooms); “arrangement” begins
Apr 21, 1485

SAF: Encounter their first few relationships, which end messily, prompt introspection, and sow seeds for compartmentalization
Apr 21, 1486

SAF: Experiment begins, compartmentalization tinkered with and perfected; crafts surveillance system for /own/ area, not whole of LN
Period: Apr 22, 1486 to Apr 22, 1511

SA's Experiment
Apr 21, 1490

SAF: Have become /very/ well known, in many senses of the word; split their energy/space between Aizen’s work and their own interests
Apr 21, 1493

Nnoitra shows up in Las Noches, is one of the first hollow remade using SAF’s streamlined methodology, ranks 8th
Jul 21, 1493

Nn: Falls in with SAF, becomes unlikely “friend,” due mostly to not falling for SAF’s act of enjoying his “data collection” [NOTE 3]
Apr 21, 1494

SAF: Demoted from espada (infraction is likely putting his own projects before Aizen’s—could be surveillance issue as above)
May 21, 1494

Aizen orders lab relocated from central Las Noches to tower at outskirts; gives detailed reporting/meeting schedule
Period: May 21, 1494 to Oct 21, 1494

SAF relocating to current lab space
Jun 21, 1494

Espada: Barragan, Imanol, Neliel Tu, Cirucci, Dordonii, Gantenbain, Grimmjow, Nnoitra, Zommari, Aaroniero (SAF must attend to report)
Sep 21, 1494

SAF: Begin work on caja negaccion, hallways, full surveillance; begin having issues with sleep and fitting everything into their day
Apr 21, 1495

Nn: Becomes disgruntled by Neliel Tu and begins long, escalating, attempts to dislodge her; whines to SAF, receives no sympathy
Oct 21, 1495

Rising tensions: Nnoitra vs Neliel Tu; SAF vs Ilforte and Grimmjow; Imanol vs most everyone (stress relief = SAF); various numeros
Dec 21, 1495

Aizen sends out teams to “recruit others” and “search for vasto lorde;” actually an attempt to instill team spirit and a common goal
Mar 21, 1496

SAF: Complete full surveillance system, wire it to Aizen’s viewing room /and/ the lab; Aizen “asks” about it, is told it’s for backup/archiving
Apr 21, 1496

Grimmjow overpowers Gantenbain in “spar,” Azien sees footage, promotes Grimmjow (6th); Gantenbain now privaron; others get ideas
May 21, 1496

Tensions escalate across the board; Grimmjow relaxes antagonism toward SAF (thanks for the footage), but Ilforte/SAF tension remains
Mar 21, 1497

Aizen commands that the in-fighting stop, establishes Exequias to enforce the policy in his absence
Apr 21, 1497

Nn: Goes on particularly long distance “recruiting” mission with Neliel Tu, grows to hate her even more
Apr 24, 1497

Imanol followed around by Rudobone’s minions, grows increasingly agitated and irritable
Jul 21, 1497

Aizen puts increased pressure on SAF to deliver caja negaccion project to be used as temporary holding cells for fight-happy arrancar
Feb 21, 1498

Tesla arrives in Las Noches, gets in fight with Di Roy and the rest of Grimmjow’s posse, is reprimanded and told the laws by Rudobone
Apr 21, 1498

SAF: Finally harness negaccion field and begin testing prototypes (on pluses dragged to HM via a different device made for that purpose)
Jun 16, 1498

Nn: Returns from mission with Neliel Tu, seeks out SAF to kvetch, can’t find him; does attract the attention of a numero named Tesla
Jun 21, 1498

Unfortunate Episode: Imanol sneaks to lab, begs for session; SAF agree; Imanol loses control, traps SAF in caja negaccion [NOTE 4]
Jun 21, 1498

Aizen recruits Ichimaru Gin, begins testing on pluses; Kisuke made captain; Mayuri released from Maggot’s Nest
Jul 16, 1498

SAF: Escape caja negaccion; manage partial resurreccion; report caja negaccion a success; Aizen confiscates zan as punishment [NOTE 5]
Aug 21, 1498

Nn: Spends inordinate amount of time following SAF—to keep Imanol from finishing the unfortunate episode (and to avoid Tesla)
Sep 21, 1498

SA: Works on dome project, researches mask damage/repair via test subjects, fine-tunes lab security to specifically keep Imanol out
Oct 21, 1498

H: Hammerhead arrancar encounters the ladies on recruiting mission; flashback events; they start for Las Noches, going slowly
Oct 21, 1498

Aizen returns Fornicaras; SAF immediately begin work on spiritual blueprints for Gabriel while working to restore mask/reishi
Jan 21, 1499

SAF: Accompany Nnoitra on recruiting mission to avoid Imanol (and Tesla); consume/merge with Verona, Lumina, Unknown [NOTE 6]
Apr 21, 1520

End Times

Natural arrancar wandering on their own include all canon privaron and Neliel Tu (sans fraccion), plus several others

Natural arrancar in the area congregate, build crude but passable palace, try to bring civilization to the area

Barragan arrives with posse, takes over, drives off natural arrancar; Las Noches in ruins

Barragan rules Las Noches

SA: Lives in region of the wilds known as the acid waste (parted ways with Ilforte long ago when the older left for gentler climes)

Grimmjow stalks about, pre-posse

H: Moves into new territory, is hounded by Barragan and others

Aizen locates/studies natural arrancar scattered far and wide over Hueco Mundo, starts keeping tabs on them

SA: Forms close alliance with Fornicaras

Aizen adds powerful, interesting, or unique hollow to his “stalk” list, hoping to follow their progress and make use of them later

Aizen overthrows Barragan and rules in absentia; Barragan pretends nothing happened, rebuilds his army [AU: NOTE 1]

Aizen begins assembling natural arrancar (signing them up, but leaving them in their natural habitats)

SA: Merges with Fornicaras with surprising success; SAF find that their area cannot support their stronger self and migrate

H: Comes to Mila Rose’s aid and determines that she will try a new tactic when combating the males in her new territory

H: Invites Sung-Sun to join her little group

Grimmjow's posse gathers, Ilforte and Shawlong vie for leadership

H: Rescues Apacci, flashback contents up until Barragan’s threat; the four ladies migrate elsewhere rather than fight

Grimmjow’s posse attacks him, makes him king; they keep to the edges of Las Noches

SAF: Settle into well-defined territory; tend toward brutal ambush followed by experimentation on / consumption of prey items

Grimmjow and posse part ways, om-nom-nom

Aizen recalls natural arrancar to Las Noches under Barragan's regency; Barragan under surveillance to keep the peace

Aizen approaches Grimmjow’s posse, makes Shawlong an arrancar (11), recruits Grimmjow (12), makes the rest (13 etc.)

Zommari is recruited and made an arrancar

Barragan remade (as primera); beginning of espada ranking system

Imanol arrives, is remade, overthrows Unknown to become 2nd espada

Aizen recruits Tousen Kaname, begins work on his theory of how to break masks to mimic the natural arrancarization process

Aizen and Co. make arrancar of assorted powerful hollow they come across, but leave them in their habitats as advertisements

Aizen approaches SAF, describes a lab environment, offers one; they consider, but have vanished by the time Aizen returns

Imanol and Neliel Tu take on followers from among the numeros, these become the first fraccion

SAF: Some incident or other in their new location that prompts them to reconsider Aizen’s offer (positive, negative, or neutral)

Aaroniero (AA) is made into an arrancar, and takes the 10th rank [AU: NOTE 2]

Aizen locates Harribel and posse, pulls strings so they are pressured to move back to the Las Noches area; they persevere where they are

Espada: Barragan, Imanol, Neliel Tu, Cirucci, Dordonii, Gantenbain, Grimmjow, Zommari, Szayel Aporro, Aaroniero

SAF: Shows up at Las Noches, is made an arrancar (w/ odd split), ranks 9th by trickery alone—surprising /everyone/ (esp. Ilforte)

SAF: Tensions between SAF and Ilforte pick up again almost immediately, escalate rapidly, and are quite public

Aizen sets aside lab area in Las Noches; SAF’s tasks: improved garganta, dome blueprints, streamlined arrancarization process

SAF: Have dispute with Imanol in hallway (Imanol is angry that the “lab” is bigger than his suite of rooms); “arrangement” begins

SAF: Encounter their first few relationships, which end messily, prompt introspection, and sow seeds for compartmentalization

SAF: Experiment begins, compartmentalization tinkered with and perfected; crafts surveillance system for /own/ area, not whole of LN

SA's Experiment

SAF: Have become /very/ well known, in many senses of the word; split their energy/space between Aizen’s work and their own interests

Nnoitra shows up in Las Noches, is one of the first hollow remade using SAF’s streamlined methodology, ranks 8th

Nn: Falls in with SAF, becomes unlikely “friend,” due mostly to not falling for SAF’s act of enjoying his “data collection” [NOTE 3]

SAF: Demoted from espada (infraction is likely putting his own projects before Aizen’s—could be surveillance issue as above)

Aizen orders lab relocated from central Las Noches to tower at outskirts; gives detailed reporting/meeting schedule

SAF relocating to current lab space

Espada: Barragan, Imanol, Neliel Tu, Cirucci, Dordonii, Gantenbain, Grimmjow, Nnoitra, Zommari, Aaroniero (SAF must attend to report)

SAF: Begin work on caja negaccion, hallways, full surveillance; begin having issues with sleep and fitting everything into their day

Nn: Becomes disgruntled by Neliel Tu and begins long, escalating, attempts to dislodge her; whines to SAF, receives no sympathy

Rising tensions: Nnoitra vs Neliel Tu; SAF vs Ilforte and Grimmjow; Imanol vs most everyone (stress relief = SAF); various numeros

Aizen sends out teams to “recruit others” and “search for vasto lorde;” actually an attempt to instill team spirit and a common goal

SAF: Complete full surveillance system, wire it to Aizen’s viewing room /and/ the lab; Aizen “asks” about it, is told it’s for backup/archiving

Grimmjow overpowers Gantenbain in “spar,” Azien sees footage, promotes Grimmjow (6th); Gantenbain now privaron; others get ideas

Tensions escalate across the board; Grimmjow relaxes antagonism toward SAF (thanks for the footage), but Ilforte/SAF tension remains

Aizen commands that the in-fighting stop, establishes Exequias to enforce the policy in his absence

Nn: Goes on particularly long distance “recruiting” mission with Neliel Tu, grows to hate her even more

Imanol followed around by Rudobone’s minions, grows increasingly agitated and irritable

Aizen puts increased pressure on SAF to deliver caja negaccion project to be used as temporary holding cells for fight-happy arrancar

Tesla arrives in Las Noches, gets in fight with Di Roy and the rest of Grimmjow’s posse, is reprimanded and told the laws by Rudobone

SAF: Finally harness negaccion field and begin testing prototypes (on pluses dragged to HM via a different device made for that purpose)

Nn: Returns from mission with Neliel Tu, seeks out SAF to kvetch, can’t find him; does attract the attention of a numero named Tesla

Unfortunate Episode: Imanol sneaks to lab, begs for session; SAF agree; Imanol loses control, traps SAF in caja negaccion [NOTE 4]

Aizen recruits Ichimaru Gin, begins testing on pluses; Kisuke made captain; Mayuri released from Maggot’s Nest

SAF: Escape caja negaccion; manage partial resurreccion; report caja negaccion a success; Aizen confiscates zan as punishment [NOTE 5]

Nn: Spends inordinate amount of time following SAF—to keep Imanol from finishing the unfortunate episode (and to avoid Tesla)

SA: Works on dome project, researches mask damage/repair via test subjects, fine-tunes lab security to specifically keep Imanol out

H: Hammerhead arrancar encounters the ladies on recruiting mission; flashback events; they start for Las Noches, going slowly

Aizen returns Fornicaras; SAF immediately begin work on spiritual blueprints for Gabriel while working to restore mask/reishi

SAF: Accompany Nnoitra on recruiting mission to avoid Imanol (and Tesla); consume/merge with Verona, Lumina, Unknown [NOTE 6]

End Times