an informal name for the ruling family of the Roman Empire from Constantius Chlorus (died 306) to the death of Julian in 363.

The Sacred Military Constantinian Order of Saint George, also historically referred to as the Imperial Constantinian Order of Saint George and the Order of the Constantinian Angelic Knights of Saint George, is a dynastic order of knighthood of the House of Bourbon-Two Sicilies.

The Constantinian shift was, according to some theologians and historians of antiquity, a set of political and theological changes that took place during the 4th-century under the leadership of Emperor Constantine the Great.

the earliest period of the Byzantine history that saw a shift in government from Rome in the West to Constantinople in the East within the Roman Empire under emperor Constantine the Great and his successors.