Rudolph (1320 – 26 August 1346), called the Valiant (le Vaillant), was the Duke of Lorraine from 1329 to his death. He was the son and successor of Frederick IV and Elisabeth, daughter of Albert I of Germany, a Habsburg, whence his name. Though he was but nine years of age when his father died and he succeeded to the duchy under the regency of his mother (until 1334), he was a warrior prince, taking part in four separate wars in Lorraine, France, Brittany, and Iberia. He was killed at the Battle of Crécy. * twins (died before 31 July 1343) * John (1346–1390), his successor