The Polish Navy (; often abbreviated to Marynarka) is the naval branch of the Polish Armed Forces. The Polish Navy consists of 46 ships and about 12,000 commissioned and enlisted personnel. The traditional ship prefix in the Polish Navy is ORP (Okręt Rzeczypospolitej Polskiej, "Warship of the Republic of Poland").
Polish–Lithuanian Commonwealth Navy
The Polish Navy has its roots in naval vessels that were largely employed on Poland's main rivers in defense of trade and commerce. During the Thirteen Years' War (1454–66), a small force of ships that primarily operated on rivers and lakes saw real open sea battles for the first time. At the Battle of Vistula Lagoon, a combined fleet of the Kingdom of Poland and the pro-Polish Prussian Confederation decisively defeated the navy of the Teutonic Knights, and secured permanent access to the Baltic Sea. In 1454, the maritime city of Gdańsk was re-incorporated to Poland after being previously occupied by the Teutonic Knights since 1308. The reintegration was confirmed in the Second Peace of Thorn (1466), and Poland acquired the means of maintaining a large fleet on the Baltic. In 1561, following a victory over a Russian fleet in the Baltic, the Polish Navy acquired a second key port at Riga, in modern-day Latvia.
At that time, as the Kingdom of Poland and the Grand Duchy of Lithuania (Polish–Lithuanian union) became involved in conflicts in Livonia, Polish king Sigismund II Augustus organized a Sea Commission (Komisja Morska) which operated between 1568 and 1572, and supported the operations of Polish privateers, but that met with opposition of the Poland's primary port, Gdańsk, which saw them as a threat to its trade operations (see Hanseatic League). This led to the development of a privateer port in Puck. Around the start of the 17th century, Poland became ruled by the House of Vasa, and was involved in a series of wars with Sweden (see also dominium maris baltici).