Eugenios Voulgaris or Boulgaris (; ; 1716–1806) was a Greek Orthodox cleric, author, educator, mathematician, astronomer, physicist, and philosopher. He wrote about every discipline: legal, historical, theological, grammatical, linguistic, astronomy, political, mathematics, archaeology, music, secularism, euthanasia, and the tides. He wrote speeches, poems, appeals to Catherine II for the liberation of Greece, and hundreds of letters. He edited valuable editions of Byzantine writers and classical books and translated many texts from Latin into French. He was one of the students of Methodios Anthrakites. He translated many important foreign language academic documents to Greek. He was bishop of Cherson (in Crimea). He was a leading contributor to the Modern Greek Enlightenment.
Youth and education
He was born on the island of Corfu, ruled by the Republic of Venice at that time, as Eleftherios Vulgares on 10 August 1716. He studied in Corfu under Vikentios Damodos, a scholar, and continued his studies in the School of Ioannina (in western Greece) under Athanasios Psalidas.
In 1737 or 1738 he became a monk and presbyter with the name Eugenios, and afterwards went to the University of Padua to study theology, philosophy, European languages and natural sciences.
Teacher of the Greek nation
In 1742, Boulgaris became director of an important school of Ioannina, the Maroutsaia. There he was involved in a public dispute with Balanos Vasilopoulos, who was the director of another high level school of the city, regarding the curricula of their respective schools – Voulgaris arguing for the institution of natural philosophy.
From 1753 to 1759 Voulgaris was director of the Athonite Academy (Athoniada Akademia) at Vatopedi Monastery aiming at upgrading the level of studies. There he taught philosophy as well as mathematics. Though he was considered one of the most eminent teachers, his eagerness to communicate some of the new ideas of the western European 'Enlightenment' caused a negative reaction among some Orthodox Christian leaders on Mount Athos. He was eventually forced to abandon the school in the beginning of 1759.
He then temporarily headed the Patriarchal Academy in Constantinople (known to Greeks as the "Great School of the Nation"). However, in 1761 he permanently abandoned his educational career.
Although Eugenios was associated by some Orthodox Christians with the unsuccessful attempt to found a Western-style academy on Mt. Athos and at the Patriarchal Academy, he was also a strong opponent of Uniate and Roman Catholic proselytising among other Christians; and in his correspondence with Pierre Leclerc, the French Catholic Jansenist theologian sympathetic to Orthodox Christian traditions, he says that since the time of the Schism Orthodox Christians have been blessed with many saints and martyrs equal to the ancients and with a bounty of miracles: "Our Church is continuously glorified and made wondrous by God, no less after the Schism than before it, and up to our times" (Epistle of Eugenios Voulgaris to Pierre Leclerc, first edition, by Andreas Koromelas [Athens, 1844], p. 68).
In Russia
After his unsuccessful attempts to introduce Enlightenment ideas to the Athonite School and Patriarchal Academy Eugenios accepted the patronage of the Russian Empress Catherine II, and spent the rest of his career in Russia. In 1763 he went to Leipzig and Berlin at the invitation of Empress Catherine. In 1771 he arrived at St. Petersburg, and between 1772 and 1774 worked as a librarian at the court.
In 1775 he was ordained archbishop, and became the first archbishop of the newly created Eparchy (Diocese) of Slaviansk and Cherson. The new diocese included lands of the Novorossiya and Azov Governorates north of the Black Sea, recently conquered by Russia from the Ottoman Crimean Khanate. Along with Russians and Ukrainians Orthodox Greeks were invited to settle in the region, and the Imperial Government thought it appropriate to appoint a Greek-speaking bishop to preside over the new diocese. Despite its name, the seat of the bishop was in neither Slaviansk (soon to be renamed Nikopol) nor Cherson, but in the more centrally located city of Poltava; where the Monastery of the Exaltation of the Cross (, Krestovozdvizhensky Monastyr) became the bishop's residence. The following year (1776), Eugenios invited another Corfiot, Nikephoros Theotokis, to join him in Poltava, and started training the younger Greek as his successor. In 1779, Eugenios retired, although he continued to live in the same monastery in Poltava, while Nicephoros took over the diocese.