Christian A. Whap By delta788 146 BC End of Hellenistic Empire 206 BC start of Qin Empire 206 BC Start of Han Dynasty 220 AD end of Han Dynasty 221 BC End of Qin Empire 224 AD End of Parthian Empire 247 BC Start of Parthian Empire 250 BC Ashoka Begins Spreading Buddhism 313 AD Constatine Constantine issued edict allowing Christianity 320 AD Start of Gupta Empire 323 BC Start of Hellenistic Empire BC 324 BC Start of Mauryan Empire 476 AD End of Roman Empire 500 AD End of Gupta Empire Jan 1, 1927 BC Start of Roman Empire Mar 2, 2022 BC End of Mauryan Empire