1. After marrying into royalty, it’s not possible to ascend to the throne.
This rule is followed by the Queen herself. Her husband, Prince Philip, is the King-Consort, which doesn’t give him the right to become King. He is a Greek national, therefore he has no claim to the throne. The same is happening with Prince William:
if he becomes King, then Catherine, Duchess of Cambridge, will have her title changed to Queen-Consort.
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