His exact birth date is unknown .
Theobald of Bec ( c. 1090 -- 18 April 1161 ) was a Norman archbishop of Canterbury from 1139 to 1161 .
Theobald of Bec 's exact birth date is unknown .
Theobald of Bec ( c. 1090 -- 18 April 1161 ) was a Norman archbishop of Canterbury from 1139 to 1161 .