"The discovery of the sealing with the inscription Shaushtatar, son of Parshatatar, the king of Mitanni‘ (circa 1440 BC) is extremely important. It was also used later by at least four generations of kings of this state with Indo-Aryan names. The impressions of this seal were found on tablets with the texts mentioning the ruler and his donations of villages in the region from the eastern bank of the Tigris to the western bank of the Euphrates in the settlements of Nuzi, Umm el-Marra, Tell Brak and Tell Bazi (northern Syria). This seal depicts the slaughter of a one-horned zebu... Thus it combines two images of Rigveda and Mature Harappa in a socially, politically and ritually significant context — that of a unicorn and that of a zebu."
January 1, 1970
https://en.wikiquote.org/wiki/Cattle_in_religion_and_mythology