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ISIS is formed by a radical Muslim named Abu Musab al-Zarqawi.
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Abu Musab al-Zarqawi and his group pledge their allegiance to to al-Qaeda leader Osama bin Laden. He also renamed the group.
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A US airstrike kills Abu Musab al-Zarqawi. Egyptian militant Abu Ayyub al-Masri takes over as the leader of ISIS.
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ISIS joins forces with other smaller groups. They lay down their goals and announce the establishment of an Islamic State in Iraq (ISI).
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Abu Ayyub al-Masri and Abu Omar al-Baghdadi, co-leaders of ISI, are both killed in a US-Iraqi raid.
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ISIS proclaims a worldwide caliphate.
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Abu Sayyaf (a group of radical Muslims in the Philippines) pledges their allegiance to ISIS.
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Boko Haram, a large terrorist organization in Africa, swears their allegiance to ISIS, spreading their reach even farther across the world.
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Members of the Islamic Movement of Uzbekistan swear allegiance to ISIS. They also release a video showing their spiritual leader pledging his allegiance to ISIS.
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A Russian flight carrying pver 200 pasengers, mostly tourists, is blown up mid-flight. ISIS immediately claims responsibility, posting pictures of the makeshift bomb.
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ISIS attack multiple targets in Paris, sending shock and disbelief throughout the world.
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One of the most recent attacks, Brussels was attacked at two seperate locations. 35 people were killed.
