Early 3rd B.C. Late 2nd B.C. 2nd-1st B.C. 75-25 B.C. 1st half of 6th B.C. 1st half of 2nd A.D. 3rd quarter of 7th B.C. 1st half of 1st A.D. 350-320 B.C. Late 2nd-Early 1st B.C. 480-479 B.C. 2nd quarter of 1st B.C. 1st quarter of 3rd B.C. 1st A.D.-267 A.D. Middle of 3rd B.C. 3rd B.C. 300 B.C. 2nd half of 3rd B.C. 1st B.C. Late 7th B.C. 250 B.C.-Early in 3rd quarter of 3rd B.C.