Resources are the most important things in any economy, no matter the age. In the world of Imperia Online, however, there are four in particular:

Wood Edit

Wood is the basic construction resource. It is provided by a Lumbermill.

Stone Edit

Stone is used to contruct your castle walls, foundations, barracks, and many other buildings. It is provided by a Stone Quarry.

Iron Edit

Iron is critical for production of Military Units. It is provided by an Iron Mine

Gold Edit

Gold is used to purchase resources at a Market, fund buildings, and show off your wealth. It is provided through Free Economics.