WI: Eleanor of Brittany marries Frederick of Austria

In 1193, Eleanor of Brittany was engaged to Frederick son of Leopold V, Duke of Austria, as part of the conditions to release of Richard who had been taken prisoner by the Emperor. However, when she was still on the way there with Baldwin of Bethune the next year, the duke died, what if Frederick of Austria survived, would he support Arthur of Brittany in his claims against John?
 
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