Unidentified famous Mandalorian warrior

During the time of conflict known as the Galactic War, a period when the Galactic Republic was at odds with the newly formed Sith Empire, there was a well-known male Mandalorian fighter. This warrior requested assistance in figuring out the identity of a masked foe against whom he fought to a stalemate on the world of Circarpous V; his goal was to engage this individual in a rematch.