Prince Christian of Denmark is the heir apparent to the throne of Denmark. He is the eldest son of Crown Prince Frederik and Crown Princess Mary. He was born on October 15, 2005, and is the first grandchild of Queen Margrethe II. Prince Christian is the fourth in line
From Wikipedia
Christian, Crown Prince of Denmark, Count of Monpezat, is the heir apparent to the Danish throne. He is the eldest child of King Frederik X and Queen Mary. He was born during the reign of his paternal grandmother, Queen Margrethe II. He became Crown Prince of Denmark following his grandmother's abdication and his father's subsequent ascension to the Danish throne in January 2024.