thumb|Pietro Antonio Solari and [[Marco Ruffo (at the bottom). Fragment of miniature from the Illustrated Chronicle of Ivan the Terrible.]]
Pietro Antonio Solari (; – May 1493), also known as Pyotr Fryazin (), was an Italian Renaissance architect and sculptor. He was invited to Moscow by Grand Prince Ivan III to design the walls and towers of the reconstructed Kremlin.
Biography
thumb|[[Apollinary Vasnetsov's depiction of the Kremlin under Ivan III.]]
He was born in Carona and apprenticed under his father Guiniforte Solari, who was the leading architect of the Duomo di Milano. In his father's workshop, he learned to draw plans and sculpture statues. Later he also sculpted a tomb of the bishop Marco de Capitani in the Cathedral of Alessandria. The use of Latin demonstrates the grand prince's aim to impress European ambassadors visiting his court with the extent of his authority.
He died in Moscow in May 1493. The Fryazin title originates from the old Russian word fryaz (), derived from frank, that was used to denote people from Northern Italy.