Achaemenidae

achae;me;nid pronunciation: function: noun inflected form(s): plural achae;menids also achae;men;i;dae etymology: greek achaimenides, from achaimenes, 7th century b.c. persian king, founder of the dynasty + -ides (patronymic suffix)date: 1889 : a member of the ruling house of ancient persia generally considered historically important from the assumption of power by cyrus the great (559 b.c.) to the overthrow of darius iii (330 b.c.)