Who's Nikolai Chagin? A Russian painter, but is his art a chagin' point?

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Nikolay Mikhailovich Chagin (Николай Михайлович Чагин; 20 November 1823 in Oryol^[1] – 1909) was a Russian architect active primarily in Vilnius and the Crimea. He took part in the Siege of Sevastopol and served as Vilno's main architect for 38 years. Chagin mastered the Byzantine Revival and several other revivalist styles, often blending them. His church buildings include: