Has it been 18 years since the last post here? Hehe. Is anyone aware of any new information on the brothers Robert? I'm just doing the Welsh folks on my tree, and Elen ferch Llwyelyn married Robert de Quincy. As it says in this thread, it would seem Saer de Quincy and Margaret had two sons named Robert. The first married Hawise of Chester, and died by 1217. The second - likely born after the first died - married Elen, and died 1257. I've looked at various sites, and don't see anything suggesting this is not the case. OTOH, as it says here:
"The Complete Peerage names him as younger brother of Roger de Quincy Earl of Winchester but does not cite the corresponding source. The primary source which confirms his parentage has not yet been identified."
So I guess there's room for error?