I believe that would be Ernst August of Hanover.
Hanover actually DID have Salic law, so Queen Victoria couldn't take that throne, which had been held by the Kings of Britain since George I. Her uncle, the Duke of Cumberland, became King of Hanover. But if Victoria had not been able to succeed in the UK, then her uncle would have done so. His descendant is Ernst August.
He is the husband of Princess Caroline of Monaco and Hanover.
Edit: One of the other posters does have a point: if the UK had had Salic law, which prevents a throne from passing not only to, but also through, a woman, then Victoria's ancestor George I could not have become King, because his claim came through a granddaughter of James I. That means that Victoria's father and uncles would never have been in line either, and therefore Ernst August of Hanover wouldn't, since his claim also comes via that woman, whose name was Sophia of Hanover.
See below: