Albert died in 1439, leaving Elizabeth a pregnant dowager with two daughters, Anne and Elizabeth. Bohemian nobility proclaimed an "interregnum", while King Vladislaus III of Poland was crowned new king of Hungary in May 1440, three months after Queen Elizabeth delivered a son, Ladislaus the Posthumous. She was determined to contend for her patrimony on her son's behalf, which led to a civil war between hers and Vladislaus's supporters. The conflict ended with the queen's death at the age of 33. Vladislaus himself died in battle in 1444, opening the path for Elizabeth's son to be recognized as king of Hungary.