The Royal Marble Gateway is a special residential building released during the Napoleon Bonaparte Historical Questline.
The Royal Marble Gateway provides population, happiness equal to the population provided, an attack boost, and produces coins every 8 hours.
When the Royal Marble Gateway is motivated, its coin production is doubled. The production is also affected by the town's happiness and by boosts of certain great buildings. The Royal Marble Gateway can be plundered if it isn't motivated.
The building also has a secondary visual effect. If the player builds it, then he/she will be able to spot Napoleon on a horse riding through the player's city.