The Korniakt Palace (Ukrainian: Палац Корнякта (Palats Korniakta), Polish: kamienica Królewska we Lwowie) on Market Square in Lviv is a prime example of the royal kamienica, or townhouse. The fabric of the palace is of various dates. It was originally built by Polish architect Piotr Barbon for merchant Konstanty Korniakt, a champion of Greek Orthodoxy and co-founder of the Lviv Dormition Brotherhood.