[5] Stephen was mentioned as the bishop of Duvno in 1355 in an engraving on the walls of a chapel in the Sustjepan graveyard in Split, Croatia.
[5] The chapel itself was built in 1825, but the material from the much older Benedictine Abbey of Saint Stephen under Pines, including the inscription, was used in its construction.
That year, Valentine returned to Makarska as bishop after the territory of his diocese was given to King Louis I as a dowry of his wife Elizabeth of Bosnia of the Kotromanić dynasty.
The next year, on 28 December 1362, the Archbishop mentioned Stephen as a bishop without a diocese and granted him the church of Saint Peter of Gumay in Sumpetar in the present-day Municipality of Dugi Rat.
[7] In 1371, Stephen was once again mentioned as the bishop of Duvno, this time as a witness in a document of the Benedictine monastery of Saint Chrysogonus in Zadar.