 Complete the following phrase:  Supporters of King Henry and his Queen, Margaret of Anjou, have been loosely called Lancastrians, the King being head of the House of Lancaster, while the duke and his party are considered Yorkists, after his title of Duke of York. By the 1450s, York felt increasingly excluded from government, and, in May 1455possibly fearing an ambush by his enemiesled an army against the King at the 