The Guild 2: Pirates of the European Seas

Summary pulled directly from Steam - Some text may only be applicable to Steam platform

The first true life simulation series set in the fascinating medieval Europe!
The Addon expands and transforms the game into an even greater experience by adding a huge area including the cities of "The Hanse" located at the shores of the European seas. Sea battles and naval trading are added to the gameplay, and a new campaign mode provides more than 10 hours of additional fun.

Key features:

Naval trading, sea battles
4 new maps, 5 different types of ships, each one can be equipped according to your needs
Campaign mode including more than 10 hours of pure medieval fun
New buildings (harbour, fishermans hut, pirate outpost), trading station as upgrade
New professions: Pirate and Medicus!
3 new offices and titles of nobility with new privileges