Louis III was the third son of King Rupert of Germany[1] and his wife Elisabeth of Nuremberg.

Louis III acted as vicar for Sigismund, Holy Roman Emperor and was his bearer during the Council of Constance.

Louis III returned very sick from a pilgrimage in 1427 into the Holy Land which he had organized after the death of his son Ruprecht.

Firstly, he married on 6 July 1402 Blanche of Lancaster (1392 – 22 May 1409), eldest daughter of King Henry IV of England and Mary de Bohun.

[3] They had one son: Secondly, he married on 30 November 1417 Matilda of Savoy,[4] daughter of Amadeo, Prince of Achaea.