Princess Margrethe was born 16 April 1940 at Frederik VIII's Palace, her parents residence at the Amalienborg palace complex, the principal residence of the Danish royal family in the district of Frederiksstaden in central Copenhagen. She was the first child of the Crown Prince and Crown Princess (later King Frederick IX and Queen Ingrid). Her father was the elder son of the then-reigning King Christian X, while her mother was the only daughter of the Crown Prince of Sweden (later King Gustaf VI Adolf). Her birth took place just one week after Nazi Germany's invasion of Denmark on 9 April 1940.