Bertrand IV de La Tour

when Guy de la Tour married Marthe Rogier of Beaufort, Popes Gregory XI's niece and Clement VI's grand niece. Their son Bertrand IV of la Tour [fr] (1375–1423)

1389, Marie married Bertrand IV, Seigneur de La Tour, the son of Guy de La Tour and Marthe Rogier de Beaufort. Her husband Bertrand died in 1423, sometime

his father, Bertrand IV, as lord of La Tour. In 1437, Bertrand succeeded his mother, Marie I, as count of Auvergne and Boulogne. Bertrand died on 20 March

Bertrand VI (c. 1417 - 26 September 1497) was lord of La Tour and count of Auvergne from 1461until his death. He was also count of Boulogne from 1461

Madeleine de La Tour d'Auvergne (1498 – 28 April 1519) was a younger daughter of Jean III de La Tour (1467– 28 March 1501), Count of Auvergne and Lauraguais