King Oswald's brother, however, avenged his death at the Battle of Winwaed and become Bretwalda.
This kingdom was formed from the union of Deira and Bernicia. One king of this kingdom invited St. Aidan to proslytize, but he died at the Battle of Maserfield fighting the king of his pagan southern neighbor. After the rule of Oswald, King Aethelstan united this kingdom with England in 927. King Oswald's brother, however, avenged his death at the Battle of Winwaed and become Bretwalda. Its King Oswiu convened the Synod of Whitby to decide between the Roman and Ionian forms of Christianity. Wulfhere ended this kingdom's three year long control over the northern section of its southern neighbor, which began when Oswiu killed Penda of Mercia. The historian Bede was from, for 10 points, this kingdom centered at York, the northernmost of the English Heptarchy.
This kingdom was formed from the union of Deira and Bernicia.
{Northumbria} [accept {Norþanhymbra}; accept {Norþhymbre}]