8th April 2021 In this series, Royal Central is taking a look at the grandchildren of monarchs around the world. In this instalment, we’re heading to Denmark to introduce the eight grandchildren of Queen Margrethe II. Children of Crown Prince Frederik and Crown Princess MaryEmbed from Getty Images Prince Christian Christian Valdemar Henri John was born on 15 October 2005, the oldest child of the Crown Prince Couple and is second in line to the Danish throne. As the Danish Royal Family had, for centuries, alternated the names of their kings between Frederick and Christian, at his birth, it was known that his first name would be Christian—his siblings’ and cousins’ names were kept mysteries until their respective christenings.