He was said to be the son of Ninus, King of Assyria, by a wife prior to his marriage to Queen Semiramis. His stepmother Semiramis despised him, and when she took over the kingdom after the death of his father Ninus, Trebeta left Assyria and went to Europe. After wandering for a time, he led a group of colonizers to settle at Trier in what is now Germany around 2000 BC.