In the XV century, Troitskaya Street was here, near which there was a boyar's yard and private estates. The courtyard of the Trinity Sergius Monastery was also located here — a place quite honorable at that time. Interestingly, two yards after his son was poisoned passed to Boris Godunov. They are mentioned in history under an interesting name — “Tsareboris Yard”. And already in 1652, the place went to Patriarch Nikon.

In 1701, a fire broke out on the square — almost all buildings were destroyed. Peter I began construction of the Arsenal here, but it was completed in 1736 by Empress Anna Ioannovna. In the 1769 project, it was planned to create on the other side of the Trinity Tower - a reflection of the Arsenal, which would serve as a mirror, and then the square would become triangular. But the project was not implemented: in the 19th century, almost all buildings were demolished and the Armory Chamber was created.

Interestingly, the idea of a triangular square was recreated in the building of the Armory Chamber: it was erected at an angle to the Trinity Tower.

But then 1812 came, and the war prevented the decoration of the Armory Chamber. The Kremlin treasures were hastily taken away from Moscow, and returned only in 1814, and in 1830 Russian guns were placed in front of the Armory Chamber.

Troitskaya Square was paved with stone, squares and bosquets are laid out near it (from the Italian boschetto - forest, grove), planted with small groups of trees that form green walls and perfectly are combined with architecture.