Pietro Antonio Trezzini

Pietro Antonio Trezzini was a Swiss architect from the Trezzini family who worked primarily in St. Petersburg. After several years of training in Milan, Trezzini arrived in St. Petersburg, perhaps summoned by a relative, Domenico Trezzini.
Trezzini collaborated with Mikhail Zemtsov on several major projects, including the Feodorovskaya Church in the new part of the Alexander Nevsky Lavra. Trezzini's contributions to mid-18th century Russian architecture have been overshadowed by those of Bartolomeo Rastrelli. His name is associated with modest, one-domed Baroque churches, such as St. Sampson's Cathedral and the Prince [Vladimir Church]. Most of his buildings later gave way to grander Neoclassical edifices.
After completing the pentacupolar Transfiguration [Cathedral (Saint Petersburg)|Transfiguration Church], Trezzini went on leave to Italy where he entered the service of the Habsburgs. He is last mentioned as living in St. Petersburg in 1760. St. Clement's [Church in Moscow] and Vladimirskaya Church in St. Petersburg are frequently cited as his last major commissions.