Konstantin Thon

Konstantin Andreyevich Thon, also spelled Ton was an official architect of Imperial Russia during the reign of Nicholas I. His major works include the Cathedral of Christ the Saviour, the Grand Kremlin Palace and the Kremlin Armoury in Moscow.

Konstantin, born in St. Petersburg to the family of a German jeweller, was one of three Thon brothers who all rose to become notable architects. He studied at the Imperial Academy of Arts under the Empire Style architect Andrey Voronikhin, best remembered for his work on the Kazan Cathedral, situated right in the middle of the Nevsky Prospekt. He studied Italian art in Rome from 1819 to 1828, and on his return home was admitted to the academy as its member and professor . In 1854, he was appointed rector of the architectural division of the academy.

Source: Wikipedia