What is "tushratta"

Tushratta ( Sanskrit Tvesa-ratha, "his chariot charges") was a king of Mitanni at the end of the reign of Amenhotep III and throughout the reign of Akhenaten—approximately the late 14th century BC. He was the son of Shuttarna II. His sister Gilukhipa and his daughter Tadukhipa were married to the Egyptian pharaoh Amenhotep III; Tadukhipa later married Akhenaten who took over his father's royal harem.

He had been placed on the throne after the murder of his brother Artashumara. He was probably quite young at the time and was destined to serve as a figurehead only. But he managed to dispose of the murderer.