Martin I of Sicily "The Younger" is James V, King of Scots' wife's third great grandmother's 2nd husband.
James V, King of Scots → Madeleine of Valois (his wife) → Claude de Valois-Orléans, reine de France (her mother) → Anne de Bretagne, reine de France (her mother) → Margaret de Foix (her mother) → Eleonor I, reina de Navarra (her mother) → Blanca I, reina de Navarra (her mother) → Martin I of Sicily "The Younger" (her husband)