Casey Freeman Timeline thingy... By 42okay 146 BC End of Hellenistic Empire 206 BC Start of Han Dynasty 206 BC End of Qin Empire 220 AD End of Han Dynasty 221 BC start of Qin Empire 224 AD End of Parthian Empire 247 BC Start of Parthian Empire 250 BC Ashoke Begins Spreading Buddhism 313 AD Constantine issues edict allowing Christianity 320 AD Start of Gupta Empire 321 BC Start of Mauryan Empire 323 BC Start of Hellenistic Empire 476 AD End of Roman Empire 550 AD End of Gupta Empire Apr 20, 1927 BC Start of Roman Empire Mar 2, 2022 BC End of Mauryan Empire