Oliver Cromwell

Oliver Cromwell (1599-1658) was an English military and political leader who briefly overthrew the monarchy.

Biography
In 1651, Oliver Cromwell led his army into the Battle of Worcester, hoping to defeat the army of Charles II. Cromwell's army heavily outnumbered Charles II and his men. Cromwell's army managed to force their opponents into retreating, after which they lost track of Charles II.

During Charles' exile to France, Oliver Cromwell was named Lord Protector of the Commonwealth and ruled over England for seven years, until he died of malaria. After his death, his son took control of parliament, but he abdicated within the month, giving Charles II a chance to take back the throne of England.

Source

 * Assassin's Creed: Project Legacy - Holidays: Chapter 1 - Ghosts of Christmas Past