Ozzy Osbourne may have built his legend as the stumbling Prince of Darkness, but those who knew him best say the late Black Sabbath frontman was far sharper – and far more troubled – than the public ever realized, RadarOnline.com can reveal.

The 76-year-old rocker, who died earlier this year after a brutal Parkinson's battle, was widely caricatured as a drug-addled showman who once bit the head off a bat on stage.

But insiders insist the mumbling, chaotic persona was a mask, concealing both a keen intellect and a tortured private life. Article continues below advertisement

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Osbourne's long career spanned groundbreaking a

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