The Cathedral of Vasily the Blessed, commonly known as Saint Basil's Cathedral, is an Orthodox church in Red Square of Moscow, and is one of the most popular cultural symbols of Russia. The building, now a museum, is officially known as the Cathedral of the Intercession of the Most Holy Theotokos on the Moat, or Pokrovsky Cathedral. It was built from 1555 to 1561 on orders from Ivan the Terrible and commemorates the capture of Kazan and Astrakhan. It was the city's tallest building until the completion of the Ivan the Great Bell Tower in 1600.
The original building, known as Trinity Church and later Trinity Cathedral, contained eight chapels arranged around a ninth, central chapel dedicated to the Intercession; a tenth chapel was erected in 1588 over the grave of the venerated local saint Vasily (Basil). In the 16th and 17th centuries, the church, perceived (as with all churches in Byzantine Christianity) as the earthly symbol of the Heavenly City, was popularly known as the "Jerusalem" and served as an allegory of the Jerusalem Temple in the annual Palm Sunday parade attended by the Patriarch of Moscow and the Tsar.