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However, the little royal almost didn’t get his Prince title when he was born – all because of an old law.
Prince Louis is fifth in line for the throne, after Prince Charles, Prince William, Prince George and Princess Charlotte.
According to Hello! magazine, a law was in place which meant that only Prince Charles’ first grandson would be given an official title.
But a few years ago, the Queen changed a law that ensured Princess Charlotte was behind Prince George in the line of succession.
Previously, she would have been superseded by her younger brother, Prince Louis.
If this law had not been changed, the youngest Cambridge child would have been known as a Lord instead.
Princess Anne, the Queen’s daughter, had the opportunity to give her children royal titles but she decided against it. Her husband, Mark Philips, also rejected an earldom before their wedding, therefore they were unable to pass on a royal title to their children, Peter Phillips and Zara Tindall, who otherwise would have been recognised with courtesy titles.
So now you know!