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This says he's the son of Lambert II and Adelaide of Normandy but I can't find any proof of this. The most I've found is he's mentioned once in the Doomsday Book / Doomsday Survey - he owned property in Lincolnshire? No where, when talking about the children of Lambert II and Adelaide of Normandy have I found Ketel mentioned. I've found his descendants check out, just not his ancestry.
If someone has sources that I can't find, send them my way please, because it its true (even if he's the bastard of one of them), I want to know! But I, myself, can't find anything to back it up XD