John de Botetourte, said to be son of King Edward I, 1st Lord Botetourte, admiral, governor of Famlingham Castle 1304, MP 1305-1324, d. 25 Nov 1324; m. 1285/92 Maud Fitz Thomas (or Fitz Otho, Otes, Otto), living 28 May 1329, daughter of Thomas Fitz Otes of Mendlesham, Suffolk, and Beatrice de Beauchamp, daughter of William de Beauchamp of Bedford. For evidence that John de Botetourte was an illegitimate son of King Edward I, see Hailes Abbey Chronicle. The family tree of Botetourte there given was considered in this case to be completely reliable by Mr. H.C. Richardson, the authority on this line, and agreed to by Sir Anthony Wagner, College of Arms. Though questioned by some, due to an apparent erasure in the parchment, the Librarian, whose care it resides, stated (and still does) that there are several other erasures and corrections, all apparently contemporary with the preparation of the original document and apparent corrections made at that time by the author which do not affect this identification. [Ancestral Roots]
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CP gives John's ancestry as "unknown".
Kay Allen AG, in a posting to soc.genealogy.medieval, cites a TAG article "The Parentage of John Botetourte (died 1324)", by F. N. Craig, July 1998: 145-153, which disproves the royal ancestry and gives a different one.