# Expansion \- Europa Universalis IV: Mare Nostrum

Summer DB entity ID: 5984083c\-e6c2\-4351\-a960\-947349c9e91a

Steam App ID: 436120

Mare Nostrum is the newest expansion to Paradox Development Studio’s best\-selling historical grand strategy game, Europa Universalis IV\. You now have 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\.   Main Features  Map Sharing This is a new diplomatic action, where you can ask other nations for their map of a certain region\. Naval Missions New mission system makes it easier to send your fleets to a region, and expect them to survive\. Barbary Pirates North African Muslim states can raid the coastlines of their neighbors for gold and sailors\. Trade Leagues Merchant republics can recruit minor nations into their Trade League for common defense and, more importantly, common riches\. Condottieri Nations can rent their armies out to fight in other people’s wars, earning valuable coin for the realm\.

## Game information

- Type: dlc

- Developer: Paradox Development Studio

- Publisher: Paradox Interactive

- Release date: Apr 5, 2016

- Coming soon: false

- Free to play: false

- Parent Steam app: 236850

- Genres: Simulation, Strategy

- Categories: Single\-player, Multi\-player, Cross\-Platform Multiplayer, Downloadable Content, Steam Achievements, Steam Trading Cards, Steam Workshop, Steam Cloud, Family Sharing

- Platforms: windows, mac, linux

- Website: Not collected

- Screenshots: https://shared\.akamai\.steamstatic\.com/store\_item\_assets/steam/apps/436120/ss\_1a328ea6bd473397a996f1c64bbb2b4f3d304903\.1920x1080\.jpg?t=1699872605, https://shared\.akamai\.steamstatic\.com/store\_item\_assets/steam/apps/436120/ss\_e53a7deea0cf5c3cd979e8affee44e081e735f5c\.1920x1080\.jpg?t=1699872605, https://shared\.akamai\.steamstatic\.com/store\_item\_assets/steam/apps/436120/ss\_857787993f68c31c05b512f33fa1a9d46d5599d4\.1920x1080\.jpg?t=1699872605, https://shared\.akamai\.steamstatic\.com/store\_item\_assets/steam/apps/436120/ss\_2d0a871833192a2aaf246867af1e03bb5fd74a2a\.1920x1080\.jpg?t=1699872605, https://shared\.akamai\.steamstatic\.com/store\_item\_assets/steam/apps/436120/ss\_acae59cd0105575a757b7eaa40f042e05222691d\.1920x1080\.jpg?t=1699872605, https://shared\.akamai\.steamstatic\.com/store\_item\_assets/steam/apps/436120/ss\_948349d13075468f62209179bd75cb85a620ffc5\.1920x1080\.jpg?t=1699872605, https://shared\.akamai\.steamstatic\.com/store\_item\_assets/steam/apps/436120/ss\_4a4b26d0e4ad8a3a7e47f69a9c414812a74ec8d5\.1920x1080\.jpg?t=1699872605

- Price: 1499 minor units USD; discount 0%

- Price country: US

## Observed metrics

- Current players: Not collected

- Steam review count: 333

- Steam positive reviews: 127

- Steam negative reviews: 206

- Steam positive percentage: 38.13813813813814%

- Summer DB rating: No native votes

Review filters: \{"language":"all","review\_type":"all","purchase\_type":"all","filter\_offtopic\_activity":0\}

## Player history

[Seven-day chart data as Markdown](/api/v1/entities/5984083c-e6c2-4351-a960-947349c9e91a/player-metrics?days=7&format=markdown) · [JSON](/api/v1/entities/5984083c-e6c2-4351-a960-947349c9e91a/player-metrics?days=7)

Chart values are hourly observed maxima. The sampled 24-hour peak and missing intervals carry explicit coverage; history before collection is unknown.

## Sources and freshness

- Catalog membership: store\_catalog

- Catalog observed: 2026\-09\-24T19:57:04\.362365\+00:00

- Details observed: 2026\-09\-22T09:10:35\.201359\+00:00

- Player count observed: Not collected

- Reviews observed: 2026\-09\-22T09:10:36\.580365\+00:00

Full provenance: \{"urls":\{"price":"https://store\.steampowered\.com/app/436120/","catalog":"https://api\.steampowered\.com/IStoreService/GetAppList/v1/","details":"https://store\.steampowered\.com/app/436120/","players":null,"reviews":"https://store\.steampowered\.com/appreviews/436120"\},"price":"2026\-09\-22T09:10:35\.201359\+00:00","source":"steam","catalog":"2026\-09\-24T19:57:04\.362365\+00:00","country":"US","details":"2026\-09\-22T09:10:35\.201359\+00:00","players":null,"reviews":"2026\-09\-22T09:10:36\.580365\+00:00","language":"en","editorial":null,"membership":"store\_catalog","observations":\{"price":"6c6f78be\-68b9\-4660\-947b\-23e63ac05200","catalog":"ded22269\-b49a\-4cd5\-8cf6\-583a9da6db2a","details":"88be8fba\-b88c\-4e51\-9952\-3c16481379f6","players":null,"reviews":"3b89cab6\-9170\-4101\-930b\-86c76c217c9a"\},"reviewFilters":\{"language":"all","review\_type":"all","purchase\_type":"all","filter\_offtopic\_activity":0\}\}

Native rating methodology: \{"count":0,"average":null,"entityId":"5984083c\-e6c2\-4351\-a960\-947349c9e91a","revision":0,"observedAt":null,"methodology":"arithmetic\-v1","distribution":\[0,0,0,0,0,0,0,0,0,0\]\}

Steam reviews are not Summer DB votes. Missing data is not zero. Player counts are observations, not historical peaks. A supplemental record does not establish that a game was delisted.

[Steam store](https://store.steampowered.com/app/436120/) · [JSON](/api/v1/games/5984083c-e6c2-4351-a960-947349c9e91a)