Andrew was a younger son of Lack, or Ladislaus, of the Hermán kindred, who was Count of the Székelys from 1328.
[1] Lack's sons and grandsons held important offices after Louis I ascended the throne in 1342.
[3] Andrew replaced his father as count of the Székelys and ispán, or head, of the Transylvanian Saxon district of Medgyes (now Mediaș in Romania) in 1343.
[6] To take revenge of the Tatar invasions of Transylvania in the previous years, Louis I dispatched Andrew to lead a military campaign across the territories subjected to the Golden Horde.
[7] Andrew and his Székely warriors crossed the Carpathian Mountains and imposed a decisive defeat upon a large Tatar army on 2 February 1345.