The Grand Church of the Winter Palace in Saint Petersburg, sometimes referred to as the Winter Palace's cathedral, was consecrated in 1763. It is located on the piano nobile in the eastern wing of the Winter Palace, and is the larger, and principal, of two churches within the palace. A smaller, more private church was constructed in 1768, near the private apartment in the northwest part of the wing. The Grand Church was designed by Francesco Rastrelli, and has been described as "one of the most splendid rooms" in the palace. Today, the church is an unconsecrated exhibition hall of the State Hermitage Museum.

The State Hermitage Museum is a museum of art and culture in Saint Petersburg, Russia. It is the second largest art museum in the world by gallery space. It was founded in 1764 when Empress Catherine the Great acquired an impressive collection of paintings from the Berlin merchant Johann Ernst Gotzkowsky. The museum celebrates the anniversary of its founding each year on 7 December, Saint Catherine's Day. It has been open to the public since 1852. [Wikipedia]