history timeline By gen.hooker 206 end of qin dynasty 206 beginning of Han dynasty 220 end of han dynasty 221 beginning of qin dynasty 226 end of parthian empire 250 beginning of parthian empire 265 Ashoka converted to buddhism 312 constantine allows christianity 320 beginning of gupta empire 323 Beginning of Alexander's hellenistic age Beginning of Alexander's hellenistic age 323 beginning of mauryan empire 507 beginning of roman empire 550 end of gupta empire Oct 19, 1930 End of Alexander's hellinistic age Oct 19, 1931 end of roman empire Mar 2, 2022 End of mauryan empire Mar 2, 2022 beginning of parthian empire