Magic 2012 has three ‘royal’ artifacts that have abilities that are all increased if a player controls all three of these artifacts. They are the Crown of Empires, Scepter of Empires and the Throne of Empires. For example, the Scepter will deal a single point of damage to a targeted player under normal conditions. However if you control the Crown and the Throne as well, this ability will deal three points of damage instead.
An important aspect of these abilities is that what happens when they resolve is not determined until they do resolve. If you control all three of these artifacts when you activate the ability of the Throne of Empires, but the Crown is destroyed in response, you will only get a single 1/1 white solider token. It does not matter what you controlled when the ability was activated. This is true for all three of these artifacts.