Yes, Black Sabbath ( Tony Iommi, Geezer Butler and Bill Ward) fired Osbourne in 1979 over his substance abuse and an overall disinterest in doing anything with the band. They replace Ozzy with Ronnie James Dio, ushering in the "Heaven and Hell" era—and the longstanding rumor that Ozzy held a grudge against Dio. But is that true?

In the wake of making the troublesome latter album, Osbourne bolted the group in 1977 and embarked on a solo project, Blizzard of Ozz, and was replaced by singer Dave Walker of Savoy Brown. However, he swiftly changed his mind and returned to the Sabbath fold for a dismal collection ironically titled “Never Say Die!”

Following Ozzy Osbourne's death, founding guitarist Tony Iommi wrote that he and his bandmates had "lost our brother"