Euchaita (Greek: Ευχάιτα) was a town (polisma) in Pontus, in northern Asia Minor (mod. Turkey). Today the Turkish village Beyözü, which partly lies on the ruins, in the province of Çorum (in the subprovince of Mecitözü).

Euchaita was the location of Saint Theodore of Amasea's slaying of the dragon, and his remains were taken here after his martyrdom. The town became a center of his cult. The original church was destroyed during the Sassanid Persian occupation, and rebuilt after the Byzantines retook the city in 622. In the 970s, Emperor John I Tzimiskes built a new church dedicated to the saint there and renamed the town Theodoropolis.

It was a favorite place to banish political and religious opponents during the Byzantine Empire. The capital of the Armeniac Theme until the late 8th century, the town suffered from Arab attacks and earthquakes.

In the late 11th century Euchaita fell to the Seljuk Turks.

In the early 21st Century, the town became the focus of an interdisciplinary archaeological project (the Avkat Archaeological Project), under the direction of John Haldon of Princeton University. Additional institutions contributing resources and personnel include Trent University, the College of Charleston, the University of Birmingham, Ankara University, and the Middle East Technical University (Ankara).

John Chrysostom (c. 347–407, Greek: Ἰωάννης ὁ Χρυσόστομος), Archbishop of Constantinople, was an important Early Church Father. He is known for his eloquence in preaching and public speaking, his denunciation of abuse of authority by both ecclesiastical and political leaders, the Divine Liturgy of St. John Chrysostom, and his ascetic sensibilities. After his death in 407 (or, according to some sources, during his life) he was given the Greek epithet chrysostomos, meaning "golden mouthed" in English, and Anglicized to Chrysostom.

The Orthodox and Eastern Catholic Churches honor him as a saint and count him among the Three Holy Hierarchs, together with Basil the Great and Gregory Nazianzus. He is recognized by the Eastern Orthodox Church and the Catholic Church as a saint and as a Doctor of the Church. Churches of the Western tradition, including the Roman Catholic Church, some Anglican provinces, and parts of the Lutheran Church, commemorate him on 13 September. Some Lutheran and many Anglican provinces commemorate him on the traditional Eastern feast day of 27 January. The Coptic Orthodox Church of Alexandria also recognizes John Chrysostom as a saint (with feast days on 16 Thout and 17 Hathor).