Leon Benois was a Russian architect, son of Nicholas Benois, brother of Alexandre Benois and grandfather of Sir Peter Ustinov. He built the Roman Catholic cathedral of Notre-Dame in St Petersburg, the mausoleum of the Grand Dukes of Russia in the Peter and Paul Fortress, and the Alexander Nevsky Cathedral, Warsaw, among many other works. Benois served as Dean of the Imperial Academy of Arts (1903-06, 1911-17) and edited the architecture magazine "Zodchiy". Wikipedia
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