It is the descendants of John of Gaunt, Duke of Lancaster, that formed one faction in the War of the Roses. The Lancasters were represented by the red rose. The split was finally resolved when Henry Tudor, himself a Lancaster, married John of Gaunt's descendant, Elizabeth York, and joined the two houses of York and Lancaster.

Duke of Lancaster and Earl of Richmond. Some say born Jun 1340, but see CP vol.XIV,p.421.
Earl of Derby, Lincoln. Duke of Aquitaine. Lord of Beaufort & Nogent.
Burke says he died at Ely House, Holborn
King of Castile & Leon. Lord of Bergerac & Roche-sur-Yon.
The Complete Peerage vol.VII,pp.410-416 & vol.XIV,p.421.


http://users.LegacyFamilyTree.com/USPresidents/Royalpresidents.htm says he died in London.