The renowned singer and dominant performer Elvis Presley has had no shortage of nicknames, but his most memorable moniker is also his grandest: “the King of Rock 'n' Roll,” or simply “the King.” Although its exact debut is unknown, that nickname made one of its earliest appearances on April 19, 1956, when reporter Bea Ramirez called Presley the “21-year-old king of the nation’s rock ’n’ roll set” in the Waco News-Tribune.

Source: Britannica