During his episcopate, he was involved in long-lasting litigations against the archbishops of Split as a representative of Bishop Valentin of Makarska over the control of Omiš and other church objects.
Bishop Madius is mentioned for the first time on 3 January 1337 in a document of the Trogir city council, where he participated as a witness.
[2] As the bull on the Madius' appointment hasn't been found, the exact year of the beginning of his episcopate remains unknown.
By the time of his and Valentin's resignation, a significant number of the Vlach population, which wasn't sympathetic to authority, nor political or ecclesiastical, arrived on the territory of their dioceses.
The two bishops were also involved in legal disputes against the archbishops of Split since 1342, with Valentin claiming control over Omiš and other church objects with support from Madius.
[5] Various authors have doubts about whether Madius was a Benedictine monk from the nearby Sustjepan monastery (Ivan Ostojić) or a Franciscan (Marijan Žugaj and Damir Karbić).