Europa Universalis IV: Mare Nostrum Collection includes the Mare Nostrum expansion and the content pack.
Mare Nostrum gives you even more tools at your disposal as you guide your nation through the early modern world. As its name suggests, Mare Nostrum introduces new systems connected to naval warfare and control of trade. The power of your fleets will depend on the number of sailors your nation can gather, and your ships can now be given missions and areas to patrol. There are also new options for creating trade leagues, and a host of other improvements.
Mare Nostrum Content Pack includes 48 new unit designs for armies of the Mediterranean and East Africa! After all, when the pageant of history unfolds on your computer screen, it’s important to be up to date with the latest fashions. Overrun your enemies while kitted out in the hottest new battle tunics!