President Donald J. Trump is the direct descendant of Hakon V King of Norway according to Icelandic genealogist Oddur F. Helgason. Mr. Trump is also related to Queen Margrethe II of Denmark, Icelandic President Guðni Th. Johannesson of Iceland, and in fact almost all Icelanders.
https://icelandmonitor.mbl.is/news/culture_and_living/2017/01/24/donald_trump_is_related_to_most_icelanders_and_dani/