Thomas of Bayeux was Archbishop of York from 1070 until his death in 1100, serving during the reigns of William I and William II. A Norman cleric closely connected to the ruling elite after the Norman Conquest of England (1066), he became one of the principal figures in the long-standing dispute over primacy between the archbishoprics of York and Canterbury.

Thomas had been a royal chaplain and treasurer to William, duke of Normandy, before accompanying the Norman regime to England. In 1070 he was appointed Archbishop of York as part of the wider reorganisation of the English church following the conquest. His elevation coincided with the appointment of Lanfranc of Pavia ⓘ as Archbishop of Canterbury, and tensions soon emerged between the two archbishops over Canterbury’s claim to primacy.

Thomas initially resisted making a profession of obedience to Canterbury, arguing that York was an independent metropolitan see. The dispute was brought before King William I ⓘ, and at the Council of Winchester in 1072 a settlement was reached affirming Canterbury’s primacy within the English church. Thomas ultimately made the required profession to Lanfranc, though the issue remained contentious and would re-emerge in later generations.

Thomas continued to govern the northern province of the English church for nearly three decades. His long tenure helped stabilise the ecclesiastical structure of northern England in the aftermath of the Norman Conquest, even as the rivalry between York and Canterbury remained a recurring feature of English ecclesiastical politics.