'The primary source which confirms his parentage has not yet been identified.' This source speculates that if he was indeed the son of Saher de Quincy and Margaret de Beaumont, he was born in or after 1217, after the oldest son Robert died in 1217. However, his mother would have been at least 45 by then, and that is assuming she was "married" (as per Jacobus) (or maybe betrothed?) at 1.
↑ Apparently it was not impossible to have 2 living children with the same name in the same family at this time in history. Therefore, he may have been a child in this family, and born before 1217 - say, around 1208, when his older brother was an adult or close to being so.
