My closest degree of kinship to King Charles III of which I am aware is due to a common descent from William, 1st Lord Ruthven. Charles is descended from Lord Ruthven's son William, Master of Ruthven, while I have a descent from William's sister Elizabeth, wife of William Hay, 5th Earl of Erroll. King Charles line goes from the Ruthvens through the Drummonds and the Lyonses and Bowes-Lyonses, while mine goes through the Campbells and the Stewarts of Glenbuckie and the Stewarts of Gartnafuaran, then through the Andersons, Linns, and Shaws (my mother's family). This common descent makes me a 15th cousin once removed of King Charles.