The Birth Date is a rough estimate. See the text for details.
Biography
His father lost the crown of England but as part of the agreement, William was able to continue to hold lesser lordships there.
Death and burial of William of England
(Royal Ancestry) He died on the Toulouse expedition in October 1159, and was buried in the hospital of Montmorillon in Poitou, (France).
Source
Royal Ancestry by Douglas Richardson Vol. I. page 498
Royal Ancestry 2013 Vol. V p. 305-308
George Edward Cokayne, The complete peerage; or, A history of the House of lords and all its members from the earliest times, Vol. XII/1, Ed. Geoffrey H. White (London: The St. Catherine Press, Ltd., 1953), p. 498 n. g
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De Blois, de Warrenne-1 and Blois-24 appear to represent the same person because: I think the LNAB of Plantagenet is incorrect and based on other names he is likely to be a match for Blois-24. Dates and places are also likely to be incorrect.