Mary Queen of Scots became Queen at 6 days old. While she formally abdicated before her death, it was evidently forced and for Jacobites, generally not recognised. Also I wouldn't be suprised if James V had actually died before she was born but there was some political delay in relaying the news.
Good example; I hadn't been aware that it was possible that James V had died before her birth.
I guess you could also say of Alfonso XIII that his deposition wasn't universally accepted, but by the time he died most of his erstwhile supporters had entered Francoworld instead, whereas MQOS still had an organized political movement insisting that she had died the legitimate queen of both Scotland and England well into the eighteenth century.
