when was he appointed as archbishop of canterbury?
1138
Theobald of Bec
 King Stephen of England chose him to be Archbishop of Canterbury in 1138.
who is theobald of bec? He was a Norman archbishop of Canterbury. who did he serve? King Stephen of England
wiki:1211201
Theobald of Bec [SEP] Introduction
Theobald of Bec (c. 1090 – 18 April 1161) was a Norman archbishop of Canterbury from 1139 to 1161. His exact birth date is unknown. Some time in the late 11th or early 12th century Theobald became a monk at the Abbey of Bec, rising to the position of abbot in 1137. King Stephen of England chose him to be Archbishop of Canterbury in 1138. Canterbury's claim to primacy over the Welsh ecclesiastics was resolved during Theobald's term of office when Pope Eugene III decided in 1148 in Canterbury's favour. Theobald faced challenges to his authority from a subordinate bishop, Henry of Blois, Bishop of Winchester and King Stephen's younger brother, and his relationship with King Stephen was turbulent.