Theon of Smyrna was a Greek philosopher and mathematician, whose works were strongly influenced by the Pythagorean school of thought. His surviving On Mathematics Useful for the Understanding of Plato is an introductory survey of Greek mathematics.
Feofan/Theophan Prokopovich was a Russian Imperial Orthodox theologian, writer, poet, mathematician, and philosopher of Ukrainian origin. Rector of the Academia Mohileana in Kiev, and Archbishop of Novgorod. He elaborated upon and implemented Peter the Great's reform of the Russian Orthodox Church. Prokopovich wrote many religious verses and some of the most enduring sermons in the Russian language.
Théophile Malo Corret de la Tour d'Auvergne was a French officer named by Napoleon as the "first grenadier of France". He was also a celtomaniac antiquarian who introduced the words "dolmen" and "menhir" into general archaeological usage.
Théophile Marion Dumersan was a French writer of plays, vaudevilles, poetry, novels, chanson collections, librettos, and novels, as well as a numismatist and curator attached to the Cabinet des médailles et antiques of the Bibliothèque royale.
Theophilus Gould Steward was an American author, educator, and clergyman. He was a U.S. Army chaplain and Buffalo Soldier of 25th U.S. Colored Infantry.
Saint Theophilus the Penitent or Theophilus of Adana was a cleric in the sixth century Church who is said to have made a deal with the Devil to gain an ecclesiastical position. His story is significant as it is one of the oldest popular stories of a pact with the Devil and was an inspiration for the Faust legend. Eutychianus of Adana, who claimed to be an eyewitness of the events, is the first to record Theophilus's story.
