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I can't check the Avisa of Gloucester marriage. [1] says Geoffrey FitzPiers married Aveline de Clare. That is consistent with Roger de Clare, 3rd Earl of Hertford. Charles Matthews ( talk) 13:56, 19 February 2008 (UTC) reply

OK, it now appears that she was the second of Geoffrey's three wives [2]. Charles Matthews ( talk) 14:02, 19 February 2008 (UTC) reply

I suggest this ancestry of him:

Dmitry Azikov ( talk) 09:36, 3 July 2024 (UTC) reply

The important bits of the ancestry are already in the article - who his father was. The rest of it isn't useful to understanding the life of William. Again - I point to WP:NOTGENEALOGY. We are not a genealogical work and should not present such information when biographies of the subject do not do so. And again, many of these works are not very reliable - Weis and Burke are not good sources for this information. Also - the use of the name "Robert FitzRoy" is deceptive - we don't have that as an alternate name for Robert nor should we put that Robert's maternal grandfather was certain - Robert's article makes it clear that this is not a certain parentage for Robert's mother. Ealdgyth ( talk) 12:15, 3 July 2024 (UTC) reply