Elizabeth of Hungary was a member of the House of Árpád and by marriage Duchess of Greater Poland.
She was the eldest child of King Béla II of Hungary and Helena of Raška. Wikipedia
Born: 1128
Died: July 21, 1154 (age 26 years)
Parents: Béla II of Hungary and Helena of Serbia, Queen of Hungary
Grandchildren: Władysław Odonic, Agnes of Landsberg, Frederick II, Duke of Lorraine, and more
Spouse: Mieszko III of Poland (m. 1136)
House: House of Arpad