Assassin's Creed: Brotherhood - Copernicus Conspiracy Missions

The first DLC for Assassin's Creed: Brotherhood game lets you meet the scientist Copernicus as you save his life from the Vatican soldiers sent to kill him. Apparently the Master of the Sacred Palace at the Vatican wanted his ideas and discoveries to be exclusive, but when he refused he was branded a target. After you save Copernicus, you will have to deliver the letters to some of his friends to warn them about the soldiers, each task will be race with time. Finally, you will find out who exactly is behind the assassination attempts and will gladly put a stop to that, because Ezio too is no friend of Borgia. These missions will appear on the map while in Rome. This DLC has around 350 MB and is free.