He then acted as a mediator between them and Marco Barbadigo, the husband of Helena Thopia who was in possession of the castle in Krujë during this period.
[8] In 1402, as an Ottoman vassal and together with other Albanian noblemen, he fought alongside Bayezid I's forces in the Battle of Ankara.
They were initially unwilling vassals of the Ottomans, but Koja and Jonima would eventually accept the suzerainty of the Venetian Republic by feigning the defeat of a large force under their command at the hands of the Venetians.
[11][12][13][14] Jonima recognised the influence of the Dukagjini family in the northern Albanian regions, and so he developed good diplomatic relations with them and communicated with foreign chancellors (Venetians in particular) on their behalf.
He is last mentioned by sources in 1409 as the lord of Shufadaj, a coastal trading town near Lezhë, and is supposed to have died in the same year.