What is "thurstan"

Thurstan or Turstin of Bayeux ( c. 1070 – 6 February 1140) was a medieval Archbishop of York, the son of a priest. He served kings William II and Henry I of England before his election to the see of York in 1114. Once elected, his consecration was delayed for five years while he fought attempts by the Archbishop of Canterbury to assert primacy over York. Eventually, he was consecrated by the pope instead and allowed to return to England. While archbishop, he secured two new suffragan bishops for his province. When Henry I died, Thurstan supported Henry's nephew Stephen of Blois as king. Thurstan also defended the northern part of England from invasion by the Scots, taking a leading part in organising the English forces at the Battle of the Standard (1138). Shortly before his death, Thurstan resigned from his see and took the habit of a Cluniac monk.