Oliwa (Oliva; Òlëwa; Oliva) is a northern district of the city of Gdańsk, Poland. From east it borders Przymorze and Żabianka, from the north Sopot and from the south with the districts of Strzyża, VII Dwór and Brętowo, while from the west with Matarnia and Osowa. It is known for its medieval monastery with the Oliwa Cathedral, the 1627 Battle of Oliwa and the 1660 Treaty of Oliva. Oliwa is a part of the city of Gdańsk now in northern Poland. It is bordered on the east by the Bay of Gdańsk (Zatoka Gdańska), on the north by the town of Sopot, on the south by the boroughs of Wrzeszcz and Zaspa and on the west by the chain of hills and forest surrounding Gdańsk. Except for the 'old city' Oliwa encompasses the boroughs of Polanki, Jelitkowo, Przymorze and Żabianka. The population in 2004 was 19,824. The area is with a population density of . The landmark of Oliwa is the Cistercian-Cathedral complex with the Oliwa Cathedral, Baroque Abbot's Palace, Adam Mickiewicz Park, botanical garden and old granaries. The complex is listed as a Historic Monument of Poland. The complex houses two branches of the National Museum in Gdańsk: the Department of Modern Art in the Abbot's Palace and the Ethnographic Department in one of the historic granaries. Other sights of Oliwa include the observation tower at the Pachołek Hill, the Gdańsk Zoo. The Hala Olivia indoor arena, home venue of the Stoczniowiec Gdańsk ice hockey team, is located in Oliwa. It is not exactly known when Oliwa was established. Archeological excavations suggest that the first settlement in this area was established in early Iron Age. The Cistercian Monks' tradition (unconfirmed by other sources) speaks of it as an early seat of power of the Pomeranian Princes. The name of this suspected burgh is unknown. The first mention of Oliwa dates to 1186 when the Cistercians established a monastery there. The Cistercian Monks named it Oliva, either derived from an older Slavic name or the biblical Mount of Olives or olive tree. The monks received a deed of ownership from Duke Sambor I of Pomerania in 1188.