226				Sassanid Era
BC   238				Fall of Seleucid Dynasty
BC   238				Parthian Empire
BC   323				Seleucid Dynasty
BC   331				Alexander the Great conquers Persia
BC   338				Greeks plan to conquer Achaemenid Empire
BC   522				Greatest extent under Achaemenid Empire
BC   530				Egypt annexed to Achaemenid Empire
BC   539				More conquests of Cyrus
BC   550				Cyrus conquers Median Empire