Last year around this time, a royal couple visited Canada.

Prince William (second in line to the throne of England) had just gotten married to Catherine Middleton and the two spent much of their honeymoon touring Canada.

Next month Canada will get a visit from another royal couple—this time, it’s the father of the groom. Prince Charles is William’s father.

Charles is first in line to the throne. That means that when his mother—Queen Elizabeth—steps down, Charles will become king.

Charles will come to Canada with his second wife, Camilla.

Charles’ first wife was one of the most well-known and popular celebrities in the world, Princess Diana.

(Princess Di, as she was known, was killed in a car crash in 1997. When that happened, millions of people around the world mourned.)

Charles and Camilla will tour New Brunswick, Ontario and Saskatchewan from May 20 to 23.