From York there went to the national Parliament the lord Archbishop of York, the lord Abbot of St. Mary's Abbey, those nobles who resided in the city and were Lords Temporal, and the two representatives of the commonalty of the city. The body of Lords Spiritual was of great importance in the Middle Ages. The Convocation of the lords of the Church had itself a share in the governing of the nation as well as of the Church, its own particular sphere. The Church was one of the most powerful and richest factors in national affairs. The clear division of the Parliament of the Middle Ages into three groups reflects the sharp divisions that there were between the three great classes of the nation--the nobles, the clergy, the people. In the fifteenth century, as in other centuries, York was frequently visited by the King. From time to time, as when the King and Court proceeded north during the wars with Scotland, Parliament was moved to York, where it was held in the Chapter House of the Minster. Six of the seven windows of the Chapter House contain their original stained glass, in which appear shields of King Edward I. and members of the Court. The Chapter House was used as a Parliament house during the reigns of the first three Edwards. The King, in mediæval times, was actual commander-in-chief, and it suited him well for Parliament to meet in the political capital of the north, so that he could continue the civil administration while conducting warfare in the north. Henry IV. was in York on several occasions, chiefly because of rebellions. The house of Percy, which engaged frequently in revolt and faction, led the rebellion of 1403 in which Henry Percy, called Hotspur, was killed at the battle of Shrewsbury. Harry Hotspur, whom Shakespeare made in accordance with tradition the fiery and valorous counterpart of Prince Hal, Henry IV.'s heir and Falstaff's companion, was buried in the Minster. When Archbishop Scrope headed a revolt, also not unconnected with the Percies, from York and was arrested, Henry IV. hastened to York, and the popular archbishop was executed forthwith, a royal and sacrilegious deed that caused intense indignation especially among the people of York, who for some months lost the right of local government as a result of this affair.