In 1258, Friedrich married Udilhild, the daughter of Hartmann, the Count of Dillingen, and sister of Bishop
Hartmann of Augsburg. Udilhild survived her husband and died as a nun in
Stetten Abbey. They had the following children: •
Friedrich VI (d. 1298), Count of Zollern : married in 1281 to Princess Kunigunde of Baden (1265–1310) • Friedrich (d. 1304),
provost in Augsburg • Adelheid (d. 1296/1308) : married Heinrich of Geroldeck (d. 1300) • Friedrich of Merkenberg (d. 1302/3), founder of the line at
Schalksburg : married in 1282 to Udilhild of Merkenberg (d. 1305) • Wilburg (died after 1300), a nun in Stetten == Footnotes ==