Annotating TImeline Unit 1 By gflores 206 the Han Empire 206 BCE–220 CE 221 the Qin Empire 221 and 206 BC. 247 the Parthian Empire 247 BC - 224 AD 275 Constantine issued edict allowing Christianity 27 February c. 272 – 22 May 337 304 Ashoka began promoting Buddhism 304 BC – 232 BC 320 the Gupta Empire ca. A.D. 320-550 321 the Mauryan Empire 321 to 185 B.C.E. 323 Alexander's Hellenistic Empire 323BC - 146BC Oct 20, 1927 the Roman Empire 27 BC to the 5th century AD
