[1] On 18 May 1309, Agnes married Duke Otto III of Lower Bavaria, who was about thirty years her senior and had been the King of Hungary under the title of Béla V from 1305 to 1307/08.

The marriage of Agnes with Otto III resulted in two children: Following the death of Otto III, the then Duke of Bavaria Louis sought guardianship over Otto's children, while Agnes and the nobles of Lower Bavaria preferred Frederick the Fair.

The dispute culminated in the Battle of Gammelsdorf in 1313, in which Louis was victorious.

[3] In 1319, Agnes married Alram, Count of Hals, with whom she had a daughter.

Her body was buried with her first husband Duke Otto III in the Seligenthal Monastery.