The current Duke of York has no female heirs.
 When the Plantagenet dynasty came to an end at the Battle of Bosworth Field on 22 August 1485, only four ducal titles remained extant, of which two were now permanently associated with the crown
 Duke remains the highest hereditary title (aside from titles borne by a reigning or formerly reigning dynasty) in Portugal (though now a republic), Spain, and the United Kingdom

