Assassin's Creed: Revelations is a 2011 historical fiction action-adventure open world stealth video game developed by Ubisoft Montreal and published by Ubisoft. It is the fourth major installment in the Assassin's Creed series, a direct sequel to 2010's Assassin’s Creed: Brotherhood, and the third and final chapter in the 'Ezio trilogy'. The game was released on Playstation 3, Xbox 360, and Microsoft Windows in November and December 2011.
The story is set in a fictional history of real world events set in three time periods, and features three returning protagonists; Altaïr Ibn-La'Ahad in 12th and 13th century Masyaf, Ezio Auditore da Firenze in 16th century Constantinople, and series protagonist Desmond Miles in 21st century America. The main story follows the Assassin Ezio's journey to unlock the secret of Altaïr's vault in Masyaf using disc-like artifacts containing Altaïr's memories. Intersecting with these historical events are the modern day activities of Desmond, who relives Ezio's memories to find a way to fight against the Assassins' enemies, the Templars, and to prevent the 2012 apocalypse. More: en.wikipedia.org.