The royal household said today that Frederik, the heir to Denmark's throne, was joined by his mother, Queen Margrethe, and his wife during the visit late on Friday.
The queen's French-born husband, 83-year-old Prince Henrik, was hospitalised with a lung infection on January 28.
Last year, the palace announced Henrik was suffering from dementia.
The palace said on Friday that Frederik, an International Olympic Committee member, left the Winter Games in Pyeongchang because his father's condition had "seriously worsened.
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