In 1268 the Serbian king invaded the Hungarian possessions south of the Danube in Mačva, what is now western central Serbia.
 In spite of some initial success, Stefan Uroš was captured by the Hungarians and forced to purchase his release.
 A peace treaty was signed between the two kingdoms, and Stefan Uroš's son Stefan Dragutin of Serbia was married to Catherine, the daughter of the future king Stephen V of Hungary.
In 1268 the Serbian king invaded the Hungarian possessions south of the Danube in Mačva, what is now western central Serbia.  In spite of some initial success, Stefan Uroš was captured by the Hungarians and forced to purchase his release.  A peace treaty was signed between the two kingdoms, and Stefan Uroš's son Stefan Dragutin of Serbia was married to Catherine, the daughter of the future king Stephen V of Hungary.
Stefan Uroš I