Pietro Antonio Trezzini (Пётр Трезин; 1692 – after 1760) was a Swiss architect from the Trezzini

Trezzini

Trezzini family of Italian-speaking natives of Astano, canton of Ticino, Switzerland produced architects, notable for their work in Russia in 18th century. Trezzini were nobles, with a properly chartered coat of arms...

 family who worked primarily in St. Petersburg. After several years of training in Milan

Milan

Milan is the second-largest city in Italy and the capital city of the region of Lombardy and of the province of Milan. The city proper has a population of about 1.3 million, while its urban area, roughly coinciding with its administrative province and the bordering Province of Monza and Brianza ,...

, Trezzini arrived in St. Petersburg (1726), perhaps summoned by a relative, Domenico Trezzini

Domenico Trezzini

Domenico Trezzini was a Swiss Italian architect who elaborated the Petrine Baroque style of Russian architecture.Domenico was born in Astano, near Lugano, in the Italian-speaking Ticino . He probably studied in Rome...

.

Trezzini collaborated with Mikhail Zemtsov

Mikhail Zemtsov

Mikhail Grigorievich Zemtsov was a Russian architect who practiced a sober, restrained Petrine Baroque style, which he learned from his peer Domenico Tresini...

 on several major projects, including the new part of Alexander Nevsky Lavra

Alexander Nevsky Lavra

Saint Alexander Nevsky Lavra or Saint Alexander Nevsky Monastery was founded by Peter I of Russia in 1710 at the eastern end of the Nevsky Prospekt in St. Petersburg supposing that that was the site of the Neva Battle in 1240 when Alexander Nevsky, a prince, defeated the Swedes; however, the battle...

. Trezzini's contributions to mid-18th century Russian architecture

Russian architecture

Russian architecture follows a tradition whose roots were established in the Eastern Slavic state of Kievan Rus'. After the fall of Kiev, Russian architectural history continued in the principalities of Vladimir-Suzdal, Novgorod, the succeeding states of the Tsardom of Russia, the Russian Empire,...

 have been overshadowed by those of Bartolomeo Rastrelli

Bartolomeo Rastrelli

Francesco Bartolomeo Rastrelli was an Italian architect naturalized Russian. He developed an easily recognizable style of Late Baroque, both sumptuous and majestic...

. His name is associated with modest, one-domed Baroque churches, such as St. Sampson's Cathedral and the Prince Vladimir Church

Prince Vladimir Church

The Prince Vladimir Church , formally the Church of St. Prince Vladimir Equal to the Apostles is a Russian Orthodox Church in Saint Petersburg, Russia...

. Most of his buildings later gave way to grander Neoclassical

Neoclassical architecture

Neoclassical architecture was an architectural style produced by the neoclassical movement that began in the mid-18th century, manifested both in its details as a reaction against the Rococo style of naturalistic ornament, and in its architectural formulas as an outgrowth of some classicizing...

 edifices.

After completing the pentacupolar Transfiguration Church

Transfiguration Cathedral (Saint Petersburg)

Transfiguration Cathedral is an Eastern Orthodox cathedral belonging to the Diocese of St. Petersburg. It is located on Transfiguration Square , just off Liteyny Prospekt near the Chernyshevskaya metro station...

, Trezzini went on leave to Italy (1751) 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 is frequently cited as his last major commission.