Unit 1 timeline By claudia_m 206 Start of Han Empire B.C.E. 206 End of Quin Empire B.C.E. 220 End of Han Empire C.E. 221 Start of the Quin Empire B.C.E. 224 End of Parthian Empire C.E. 230 End of Alexander's Hellenistic Empire B.C.E. 247 Start of Parthian Empire B.C.E. 256 Ashoka began promoting Buddhism B.C.E. 312 Constantine issued edict allowing Christianity C.E. 320 Start of Gupta Empire C.E. 323 Start of Alexander's Hellenistic Empire B.C.E. 324 Start of Mauryan Empire B.C.E. 476 End of Roman Empire C.E. 550 End of Gupta Empire C.E. Mar 2, 2022 End of Mauryan Empire B.C.E. Mar 2, 2022 Start of Roman Empire B.C.E.