- Born: , , England
- Marriage: Goditha 
- Died: , , England
Sources, Comments and Notes:
"WILLIAM "Taillebois" de Lancaster, son of GILBERT & his wife Goditha --- (-after 1166). According to a document some generations later, he was also referred to as William de Tailboys (de Taillebois) when younger. He is the first person of whom there is any record to bear the name of Lancaster and pass it on to his descendants as a family name. ..."
"William de Lancaster I, or William Fitz Gilbert, was a nobleman of the 12th century in Northwest England. ...
William's father was named Gilbert, and his mother was Godith. They are both mentioned clearly in a benefaction of William to St Mary de Pré and William was often referred to as William the son of Gilbert (fitz Gilbert).
William was also said to have descended from both Ivo de Taillebois and Eldred of Workington, who were contemporaries of William Rufus. But the exact nature of the relationship is unclear and indeed controversial. Most likely, the connection is through daughters or illegitimate sons of these two men. A discussion of the three main proposals follows:
Theory 1. Taillebois and Workington both the male line. ...
Theory 2. Taillebois through his father. ...
Theory 3. Workington through his mother. ...
Gilbert married Goditha  [MRIN: 1844]. (Goditha  was born in , , England and died in , , England.)