countess Katerina, lady of Celje, co-heiress of Slovene lands of Heunburg - Abt 1316 Parents Ulrich II, Count of Heunburg Agnes of Baden Children Frederick I, Count of Celje Anna von Zovnek (Sannegg) Siblings Friedrich von Heunburg Elisabeth von Heunburg countess Margareta, co-heiress of Heunburg Partners Ulrich II. of Sanneck