610-641), since Heraclius effectively established a new state after reforming the army and administration by introducing themes and by changing the official language of the Empire from Latin to Greek.As the Western Roman Empire decayed and fragmented into numerous separate kingdoms, the Byzantine Empire continued to survive, existing for more than a thousand years from its genesis in the 4th century until the Fall of Constantinople in 1453.. 
AustraLasia joko lori abo India-autralíà, pẹlu India.Ìtọ́kasí awọn orilẹ.. 