Italian police on Monday arrested Matteo Messina Denaro, the country’s most wanted Mafia boss, who had spent 30 years on the run.

Messina Denaro is accused of being a ruthless assassin whose violence fuelled the bloody reputation of the Cosa Nostra Mafia.

“With the people I have killed myself, I could fill a cemetery,” he is said to have boasted. The phrase is impossible to confirm but speaks to the legend that surrounds him.

Known as “Diabolik” after an Italian comic character, he was the undisputed leader of the Cosa Nostra in the western Sicilian province of Trapani.

But his power extended farther, including to Sicily’s capital, Palermo, where he was arrested. Messina Denaro is a fan of Rolex watches

He was once featured on an Italian magazine cover in dark glasses, looking like a rock star, but his list of victims is long and the crimes he is accused of are horrific.