The House of Thierstein (also Homberg) was a noble family of medieval Switzerland; they had the title of count from late 11th
to early 16th century and ruled over much of what is now northwestern Switzerland, including parts of the cantons of Aargau,
Bern, Solothurn and Basel-Landschaft. As advocati of the diocese of Basel and counts in Sisgau, they belonged to the higher
imperial nobility.