19. =Penda's Overthrow.=--After Oswald's fall Bernicia was ruled by his brother Oswiu. Deira, again divided from it, was governed first by Eadwine's cousin Osric, and then by Osric's son, Oswini, who acknowledged Penda as his over-lord. Oswini was a man after Aidan's own heart. Once he gave a horse to Aidan to carry him on his mission journeys. Aidan gave it away to the first beggar he met. "Is that son of a mare," answered Aidan to the reproaches of the king, "worth more in your eyes than that son of God?" Oswini fell at the bishop's feet and entreated his pardon. Aidan wept. "I am sure," he cried, "the king will not live long. I never till now saw a king humble." Aidan was right. In =651= Oswini was slain by the order of King Oswiu of Bernicia, who had long engaged in a struggle with Penda. Penda had for some years been burning and slaughtering in Bernicia, till he had turned a quarrel between himself and Oswiu into a national strife. Oswiu rescued Bernicia from destruction, and after Oswini's murder joined once more the two kingdoms together. Oswini was the last heir of AElla's house, and from that time there was but one North-humberland. In =655= Oswiu and Penda met to fight, as it seemed for supremacy over the whole of England, by the river Winwaed, near the present Leeds. The heathen Penda was defeated and slain. 20. =The Three Kingdoms and the Welsh.=--For a moment it seemed as if England would be brought together under the rule of Oswiu. After Penda's death Mercia accepted Christianity, and the newly united Mercia was split up into its original parts ruled by several kings. The supremacy of Oswiu was, however, as little to be borne by the Mercians as the supremacy of Penda had been borne by the men of North-humberland. Under Wulfhere the Mercians rose in =659= against Oswiu. All hope of uniting England was for the present at an end. For about a century and a half longer there remained three larger kingdoms--North-humberland, Mercia, and Wessex, whilst four smaller ones--East Anglia, Essex, Kent, and Sussex--were usually attached either to Mercia or to Wessex. The failure of North-humberland to maintain the power was no doubt, in the first place owing to the absence of any common danger, the fear of which would bind together its populations in self-defence. The northern Kymry of Strathclyde were no longer formidable, and they grew less formidable as years passed on. The southern Kymry of Wales were too weak to threaten Mercia, and the Welsh of the south-western peninsula were too weak to threaten Wessex. It was most unlikely that any permanent union of the English states would be brought about till some enemy arose who was more terrible to them than the Welsh could any longer be.