9. =William and Gregory VII.=--It is remarkable that such a Pope as Gregory never came into conflict with William. William appointed bishops and abbots by giving them investiture, as the presenting of the ring and staff was called. He declared that no Pope should be obeyed in England who was not acknowledged by himself, that no papal bulls or letters should have any force till he had allowed them, and that the decrees of an ecclesiastical synod should bind no one till he had confirmed them. When, at a later time, Gregory required William to do homage to the see of Rome, William refused, on the ground that homage had never been rendered by his predecessors. To all this Gregory submitted. No doubt Gregory was prudent in not provoking William's anger; but that he should have refrained from even finding fault with William may perhaps be set down to the credit of his honesty. He claimed to make himself the master of kings because as a rule they did not care to advance the purity of the Church. William did care to advance it. He chose virtuous and learned bishops, and defended the clergy against aggression from without and corruption within. Gregory may well have been content to leave power over the Church in the hands of a king who ruled it in such a fashion. 10. =The Rising of the Earls. 1075.=--Of the three classes of men over which William ruled, the great Norman barons imagined themselves to be the strongest, and were most inclined to throw off his yoke. The chief feature of the reigns of William and of his successors for three generations was the struggle which scarcely ever ceased between the Norman barons on the one side, and the king supported by the English and the clergy on the other. It was to the advantage of the king that he had not to contend against the whole of the Normans. Normans with small estates clung for support, like their English neighbours, to the crown. The first of many risings of the barons took place in =1075=. Roger, Earl of Hereford, in spite of William's prohibition, gave his sister in marriage to Ralph of Wader, Earl of Norfolk, who, though of English birth on his father's side, had fought for William at Senlac, and may practically be counted as a Norman. As the chronicler expressed it: There was that bride-ale To many men's bale.