Priorat Palace In Gatchina - Prioratsky Palace In Gatchina, St.Petersburg, Russia. Priorat Castle (Gatchina, Near Saint-Petersburg, Russia) Was Built At The End Of 18 Century By The Direction Of Russian Emperor Paul I For The Prior Of Maltese Chivalrous Order (hospitallers), Exiled By Napoleon. Architect Lvov Apply Unique Technology Of Making The Bricks From Pressed Ground. Photo