books.google.co.jp - The period 31 BC-AD 43 saw the greatest expansion of the Roman Empire. In 31 BC Octavian defeated Antony at the battle of Actium and remodelled the semi-professional Roman army into a permanent force of 28 legions. Octavian became the first emperor (Augustus) and under his leadership the legions conquered...http://books.google.co.jp/books/about/Roman_Legionary_58_BC_AD_69.html?hl=ja&id=0TKO7lOzuxMC&utm_source=gb-gplus-shareRoman Legionary 58 BC-AD 69
