 Soon afterwards he founded the monastery of Medeshamstede, which later became known as Peterborough, under abbot Seaxwulf.Following the death of Finan, bishop of Lindisfarne, Alhfrith of Deira, in collusion with Wilfred of York, Agilbert of Wessex and others, were determined to persuade Oswiu to rule in favour of the Roman rite of Christianity within the kingdoms over which he had "imperium".The case was debated in Oswiu's presence at the Synod of Whitby in 664, with Colmán, Hild and Cedd defending the Celtic rite and the tradition inherited from Aidan, and Wilifred speaking for the Roman position.