Rurik or Rurikid? Rurik was well before the Norman conquest so you probably mean one of his descendants. Well, if Ivan marries <in Russian tradition “princess of Hastings”, I have no idea who she was> AND somehow their child ends on the throne of England Then there could be a number of the interesting situations including English claim to Tsardom’s throne after Ivan’s direct line is getting extinct. With the claims from Wasa (both Polish and Swedish) happening in OTL this one would have at least some legitimacy and could provide interesting political combinations. Of course, this looks as a complete fantasy because I assume that Stewards would have a stronger lobby. Edit: A presumptive bride was Mary Hastings, daughter of Earl of Huntington (descendent of the Duke of Buckingham) and Catherine Pole (descendent of the Duke of Clarence), which made her a ‘cousin’ to the Kingsof England. Would it be enough for a realistic claim to a throne even if all other members of that family died?