 Complete the following phrase:  Albert died in 1439, leaving Elizabeth a pregt 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 sons behalf, which led to a civil war between hers and Vladislauss supporters. The conflict ended with the queens death at the age of 33. Vladislaus himself died in 