Ulrich of Sanneck
Ulrich of Sanneck (c. 1255–1316) was a free noble and Lord of Žovnek in the March of Savinja. The son of Conrad I of Sanneck, he inherited the estates. In 1278 he fought at the Battle of Marchfeld beside King Rudolf I.
In 1308 he surrendered his lands to the Habsburg dukes and received them back as a fief, bringing the Savinja Valley into Habsburg Styria. His marriage gave their son Frederick the inheritance including Celje Castle and founded the House of Celje.