Veliko Tarnovo (Bulgarian: Велико Търново) is a city in north central Bulgaria and the administrative centre of Veliko Tarnovo Province. Often referred to as the "City of the Tsars", Veliko Tarnovo is located on the Yantra River and is famous as the historical capital of the Second Bulgarian Empire, attracting many tourists with its unique architecture. Until 1965 the name of the town was Tarnovo, and this is still the common name. The old city is situated on three hills, Tsarevets, Trapezitsa and Sveta Gora raising amidst the meanders of the Yantra. Tsarevets housed the palaces of the Bulgarian Emperors and the Patriarchate with the Patriarchal Cathedral, as well as a number of administrative and residential edifices surrounded by thick walls. Trapezitsa was known for its many churches and as the main residence of the nobility. In the Middle Ages it was among the main European centres of culture and gave its name to the architecture of the Tarnovo Artistic School, painting of the Tarnovo Artistic School and literature.