Dragon Ball Super
Universe 6 Saga
Main article: Universe 6 Saga The Saiyan King is mentioned by Cabba at the end of the match between Vegeta and Cabba. After Vegeta discusses the Saiyan pride and how he hopes Cabba will surpass him, Cabba mentions the Saiyan King and his personality. Vegeta then responds by saying he hopes to meet him one day.
Being the king of all saiyans, he is undoubtedly powerful.