Pietro Angelo Flavio (Latin: Petrus Angelus Flavius;[1][2] 1526–1592) was the Grand Master of the Constantinian Order of Saint George from 1580 to 1592.
Pietro was born in 1526,[1] as the son of Giovanni Demetrio Angeli[3] and, possibly, Franceschina Magna.
[5] In the mid-15th century, his uncles Andrea and Paolo were officially acknowledged as descendants of the Angelos emperors by Pope Paul III (r. 1534–1549) and founded the Sacred Military Constantinian Order of Saint George,[6][7] a chivalric order with invented Byzantine connections.
Pietro and his wife, Lucrezia Beolchi, also had a second son, Giacomo Antonio, who died before Giovanni Andrea.
Michele's branch of the family eventually succeeded to the position given that Pietro's sons were childless.