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Pietro Angelo Flavio (Latin: Petrus Angelus Flavius; 1526–1592) was the Grand Master of the Constantinian Order of Saint George from 1580 to 1592. Pietro's family, the Angelo Flavio Comneno, claimed descent from the Angelos dynasty of Byzantine emperors, and Pietro also claimed the titles "Prince of Cilicia and Macedonia" and "Duke and Count of Drivasto and Durazzo".