From the LCMS website:
Born in Pressburg, Hungary, in 1207, Elizabeth was the daughter of King Andrew II and his wife Gertrude. Given as a bride in an arranged political marriage, Elizabeth became the wife of Louis of Thuringia in Germany at the age of 14. She had a spirit of Christian generosity and charity, and the home she established for her husband and three children in the Wartburg Castle at Eisenach was known for its hospitality and family love. Elizabeth often supervised the care of the sick and needy and even gave up her bed to a leper at one time. Widowed at the age of 20, she made provisions for her children and entered into an austere life as a nun in the Order of Saint Francis. Her self-denial led to failing health and an early death in 1231 at the age of 24. Remembered for her self-sacrificing ways, Elizabeth is commemorated through the many hospitals named for her around the world.