The ancestral castles of Thierstein and Homberg were both destroyed in the earthquake of 1356, and the Thierstein branch of the family now renamed a castle of theirs near Büsserach (in what is now known as the Thierstein District of the canton of Solothurn) to Neu-Thierstein. In 1330, a branch of the Thierstein family, known as Thierstein-Farnsburg, built Farnsburg castle near Ormalingen. They were given Sisgau as a fief from the bishop of Basel. Count Oswald von Thierstein in 1479 received Hohkönigsburg in the Alsace as fief from emperor Frederick III. The Thierstein family was extinct in 1517, after which Hohkönigsburg fell back to the House of Habsburg.