The Byzantine Calendar, also "Creation Era of Constantinople," or "Era of the World" (Greek: Έτη Γενέσεως Κόσμου κατά 'Ρωμαίους , also Έτος Κτίσεως Κόσμου or Έτος Κόσμου ) was the Calendar officially used by the Eastern Orthodox Church from ca. AD 691 to 1728 in the Ecumenical Patriarchate, by the Byzantine Empire from AD 988 to 1453, and in Russia from ca. AD 988 to 1700. Derived from the Septuagint version of the Bible, it placed the date of creation at 5,509 years before the Incarnation, and was characterized by a certain tendency which had already been a tradition amongst Hebrews and Jews to number the years from the foundation of the world. (Latin: Annus Mundi /‘Ab Origine Mundi’ (AM)). Its year one, the supposed date of creation, was September 1, 5509 BC to August 31, 5508 BC