→Byzantine era (451-843)
*650 Final defeat of [[Arianism]] as Lombards convert to Orthodox Christianity.
*657 Founding of [[Whitby Abbey]] in Yorkshire, England.
*663 Emperor Constans II is the last Eastern emperor to set foot in Rome.
*664 [[Synod of Whitby]] held in northern England, harmonizing Celtic and Roman liturgical practices in England; [[Iona|Ionian]] monk [[Wilfrid of York|Wilfrid]] appointed as Archbishop of York.