Theophilus, the first known bishop of the Goths, defended the Trinitarian and Orthodox Christological position against the Arians at the First Ecumenical Council in Nicea 325, and signed the Nicean Confession of Faith.
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The Crimean Goths themselves were a remnant of the migration-era Gothic population of Oium.
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The official language of the principality of Theodoro was Greek, but the Gothic language remained in use in private homes at least until the 18th century (Ogier Ghiselin de Busbecq in the 16th century reported having had a conversation with two Goths in Constantinople, and left a Gothic-Latin glossary with about a hundred Gothic words), but it is unknown for how long the Gothic language survived as liturgical language in the Crimean Gothic church.