an Entity references as follows:
Petar Ovčarević (Serbian Cyrillic: Петар Овчаревић; fl. 1521–41) was an Ottoman Serb and later Hungarian river flotilla commander, who during his Ottoman service spied and informed the Christian army on the intentions and movements of the Ottoman army. His last years were spent in the Eastern Hungarian Kingdom, as one of the most notable magnates. –D. Popović