[3] Sfondrati became a law student in Pavia in 1566 supported by Ragusan Senate with yearly scholarship of 30 golden scudo.

[8] In 1580 Sfondrati accompanied Bonifacio de Stefanis (Bonifacije Drakolica) who was appointed as apostolic visitor and delegate to Dalmatia, Herzegovina, Bosnia, Croatia, Vallachia, Slavonia, Serbia and other European territories governed by the Ottomans.

Two of them carried two big suitcases to de Stefanis, full of books they were instructed to deliver to priests of both Catholic and Orthodox religion.

[10] Sfondrati reported that during his voyage into Ottoman Balkans he met many Christians who converted to Islam to avoid payment of taxes, from which Muslims were exempt.

On 12 January 1576 Sfondrati wrote from Dubrovnik to Claudio Aquaviva emphasizing that Ragusan Republic have intention to publish a catechism on Slavic language for its younger population.

They were sons of Jerolim Zagurović,[13] a Venetian printer of Serbian Cyrillic books and according to some sources grandsons of Đurađ Crnojević who was the founder of the first South Slavic printing house.