Louis of Bourbon-La Marche (Louis I, Count of Vendôme) (1376 – December 21, 1446, Tours), younger son of John I, Count of La Marche and Catherine de Vendôme, was Count of Vendôme from 1393 and Count of Castres from 1425 until his death. In 1424, he married Jeanne (d. 1468), daughter of Guy XIII, Count of Laval, at Rennes. Their children were: * Catherine (b. 1425) * Gabrielle (b. 1426) * Jean VIII, Count of Vendôme (1428–1478) He also had an illegitimate son, fathered with the Englishwoman Sybil Bostum during his captivity: * John (c. 1420–1496), Bastard of Vendôme; Seigneur de Preaux