Baltiysk (Балти́йск; Pillau; Old Prussian: Pillawa; Piliava; Yiddish: פּילאַווע, Pilave) is a seaport town and the administrative center of Baltiysky District in Kaliningrad Oblast, Russia, located on the northern part of the Vistula Spit, on the shore of the Strait of Baltiysk separating the Vistula Lagoon from Gdańsk Bay. Population:
Baltiysk, the westernmost town in Russia, is a major base of the Russian Navy's Baltic Fleet and is connected to St. Petersburg by ferry.
Baltiysk was originally the site of an Old Prussian fishing village that was established on the coast of the Vistula Spit at some point in the 13th century. The village was named as "Pile" or "Pil" in several documents, possibly taking its name from pils the Old Prussian language word for fort. It was eventually conquered by the Teutonic Knights, with the name evolving into the German form of Pillau. In 1497, a storm surge dug a new gat in front of the village, and another large storm created the navigable Strait of Baltiysk through the gat on September 10, 1510. This fostered the growth of Pillau into an important port of the Duchy of Prussia, a vassal duchy of Poland, and a blockhouse was constructed in 1537, followed by a system of storehouses in 1543, and the earliest fortifications in 1550. During the Thirty Years' War, the harbor was occupied by Sweden in the aftermath of their victory over the Polish–Lithuanian Commonwealth, and King Gustavus Adolphus landed there with his reinforcements in May 1626. After the Truce of Altmark in 1629, the Swedes retained Pillau and set out upgrading its fortifications, constructing a star fort which remains one of the town's landmarks. In 1635, the citizens of Pillau paid the ransom of 10,000 thalers, whereupon Swedish forces handed over the settlement to the Elector of Brandenburg.
By the end of the 17th century, Pillau had expanded considerably, and a lighthouse and a stone church were built. Peter the Great, the Tsar of Russia, visited Pillau on three occasions, the first being in 1697 in connection with his Grand Embassy to Western Europe.