Toma Niger (Toma Nigris, bishop of Skradin and later bishop of Trogir) as an emissary of Ban Petar Berislavic, was on a diplomatic mission to the Roman Pope and to the Emperor Charles the Fifth in Brussels in 1520, to appeal for help to the defence of Croatia against the Turks. The same year the Croatian Ban was killed in the battle against the Turkish army at the town of Korenica.

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