Zvizdović was particularly distinguished by his public speaking skills even as a novice friar, and was eventually elected head of the Franciscans of Bosnia proper.
[1] After the Ottomans under Mehmed the Conqueror subjugated the Kingdom of Bosnia in 1463, and the subsequent execution of King Stephen, Zvizdović also functioned as the secular representative of the Bosnian people.
He left cliff-bound fortress of Kaštela fortress in Kozica canyon and stepped forward to meet the Sultan in Milodraž and negotiated the Ahdname of Milodraž, which can be issued only by the Sultan granting his direct protection, and with it the legal recognition of Bosnian Franciscans by the Ottoman Empire, as well as the promise of freedom of religion to Bosnia's Catholic population.
[1] A street in the central part of Sarajevo, his place of birth, in close proximity to a contemporary Bosnian-Herzegovinian parliament building, bears his name.
[4][5] The Martyrologium franciscanum includes Fra Anđeo Zvizdović among the beatified Franciscans,[2] and he is venerated as such by both friars and laypersons alike.