Saint Peter of Atroa (773–837 CE) was a Byzantine monastic leader, remembered primarily as cofounder and abbot of the influential monastery of Saint Zachariah at Atroa, below the holy mountain of Olympos in Bithynia. Peter sought to live in tranquility and solitude, traveling to the various monasteries he established in northwestern Asia Minor and occasionally joining other notable monastic figures. However, his resistance to the Iconoclast policies of imperial regimes in Constantinople during the first half of the ninth century led to his persecution and the temporary dispersal of his communities. Although he was evidently regarded with suspicion by some of his contemporaries, he gained a reputation as a miracle worker and his tomb became the site of a healing cult in the years after his death.

The Life of Saint Peter of Atroa was written by the saint’s disciple Sabas, also the biographer for Peter’s contemporary and friend Saint Ioannikios, and it survives in two manuscript versions. This volume represents an entirely new edition of the Greek text, establishing the version previously regarded as secondary as the more important of the two, and making the Life accessible to English readers for the first time.