There were 16 kings of France called Louis before the start of the French Revolution in 1789.
Harry was William's best man back in 2011.
Prince William, Kate Middleton, Prince George and Princess Charlotte have a new family member.
Prince Harry said his future wife is "hugely excited" to get involved in the commonwealth organization.
The sequence in which members of the Royal Family would come to the throne if the reigning monarch died or abdicated.
"Harry & Meghan: A Royal Romance" is slated to premiere this spring.
Royal watchers believe the Duchess of Cambridge wore a maternity dress from Jenny Packham's Fall 2017 line to the Royal Variety Performance.
The heir to the British throne also honored first responders to the attack on an Ariana Grande concert in May.
The couple receive some public money for official business.
The Duchess of Cambridge is once again suffering from severe morning sickness.
Princess Diana turned to Queen Elizabeth II for help during her marital struggles with Prince Charles, soon-to-be-aired tapes reveal.
Diana died in a car crash in 1997, and the princes have also made plans to commemorate the 10th anniversary of her death in August.