Art historians say they have discovered a cache of over 100 early works by Caravaggio in a castle in Milan. The remarkable discovery, details of which will be published online today, was last night valued at more than $750 million. Researchers who had been hunting for traces of Caravaggio’s early work found the collection of sketches and paintings in the workshop of mannerist painter Simone Peterzano in Milan’s Sforzesco castle. Peterzano was the master of Michelangelo Merisi, better known as Caravaggio, from 1584 to 1588. “We always felt it was impossible that Caravaggio left no record, no studies in the workshop of a painter as famous as his mentor,” Maurizio Bernardelli Curuz Guerrieri, artistic director for the Brescia Museum Foundation said.