He returned to Rome in 1691 to represent the Maronite Church in a legal dispute. After completing this assignment, he was commissioned by Cosimo III de' Medici to organize an Oriental-language printing establishment in Florence. His goal there was to prepare and print Oriental-language editions of theological manuscripts for the Palatina Library at Parma and the Laurentian Library at Florence. Soon after, he was designated the chair of Hebrew at the University of Pisa. In 1708, he became a member of the Society of Jesus, also known as the Jesuits.
Shortly after he joined the Jesuit order, Pope Clement XI appointed him to a commission intended to organize the printing of a corrected edition of the Septuagint. His most notable work is a collected edition of the works of St. Ephrem the Syrian, a prolific writer in the Syriac language, with accompanying Latin translation. He had only published two volumes of this collection when he died in 1742. The third volume was completed by Stephen Assemani.
This article incorporates text from a publication now in the public domain: Herbermann, Charles, ed. (1913). "Catholic Encyclopedia (1913)/Peter Ambarach". Catholic Encyclopedia. New York: Robert Appleton.
- "Catholic Encyclopedia: Peter Ambarach". www.newadvent.org. Retrieved 2017-02-05.
- O'Neill, Charles E. (2001-01-01). Diccionario histórico de la Compañía de Jesús: AA-Costa Rica (in Spanish). Univ Pontifica Comillas. p. 406. ISBN 9788484680376.
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