The rock and roll star famously nicknamed "The King" is Elvis Presley. Elvis Presley is widely regarded as one of the most significant and influential figures in the history of popular music. His charismatic stage presence, unique voice, and fusion of various music genres, including rock and roll, country, and gospel, contributed to his immense success and cultural impact. Elvis Presley earned the title "The King" due to his massive popularity and his role in popularizing rock and roll music during the 1950s and beyond. His iconic status as "The King" continues to be recognized and celebrated to this day.