WI: Robert Curthose marries St Margaret

Is it possible for Robert Curthose to marry St Margaret? and pehaps his brother Henry could get Urraca of Castile-Leon as a wife, that might be interesting.
 
Are we talking about... after 1066? Cuz without something else happening to prevent the course of events that took place leading to their marriages, I doubt it. The age differences between the brides and the grooms is rather... pronounced.
 
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