Callias II in Wikipedia

Callias (Greek: Καλλίας) was the head of a wealthy Athenian family, and fought at the Battle of Marathon (490) in priestly attire. His son, Hipponicus, was also a military commander. He is commonly known as Callias II to distinguish him from his grandfather, Callias I, and from his grandson, Callias III. Some time after the death of Cimon, probably about 445 BC, he was sent to Susa to conclude with Artaxerxes I, king of Persia, a treaty of peace named the Peace of Callias. At all events, Callias' mission does not seem to have been successful. He was indicted for high treason on his return to Athens and sentenced to a fine of fifty talents.