The Bosporan Kingdom was the longest surviving known Roman client kingdom (allied state). It was a Roman Province between 63 and 68, under Roman Emperor Nero. In the 1st century and 2nd century AD was a period of a new 'golden age' of the Bosporan Kingdom when it was famous for its jewellery. In the end of the 2nd century the King Sauromates II inflicted a critical defeat to the Scythians (a nomadic tribe) and included all the territories of the Crimea in the structure of his state.