17. =Oswald and Aidan.=--In the days of Eadwine, Oswald, as the heir of the rival house of Bernicia, had passed his youth in exile, and had been converted to Christianity in the monastery of Hii, the island now known as Iona. The monastery had been founded by Columba, an Irish Scot. Christianity had been introduced into Ireland by Patrick early in the fifth century. Ireland was a land of constant and cruel war between its tribes, and all who wished to be Christians in more than name withdrew themselves into monasteries, where they lived an even stricter and more ascetic life than the monks did in other parts of Western Europe. Bishops were retained in the monasteries to ordain priests, but they were entirely powerless. Columba's monastery at Hii sent its missionaries abroad, and brought Picts as well as Scots under the influence of Christianity. Oswald now requested its abbot, the successor of Columba, to send a missionary to preach the faith to the men of North-humberland in the place of Paulinus, who had fled when Eadwine was slain. The first who was sent came back reporting that the people were too stubborn to be converted. "Was it their stubbornness or your harshness?" asked the monk Aidan. "Did you forget to give them the milk first and then the meat?" Aidan was chosen to take the place of the brother who had failed. He established himself, not in an inland town, but in Holy Island. His life was spent in wandering amongst the men of the valleys opposite, winning them over by his gentleness and his self-denying energy. Oswald, warrior as he was, had almost all the gentleness and piety of Aidan. 'By reason of his constant habit of praying or giving thanks to the Lord he was wont whenever he sat to hold his hands upturned on his knees.' On one occasion when he sat down to a feast with Aidan by his side, he sent both the dainties before him and the silver dish on which they had been served to be divided amongst the poor. "May this hand," exclaimed the delighted Aidan, "never grow old!" 18. =Oswald's Greatness and Overthrow.=--As a king Oswald based his power on the acknowledgment of his over-lordship by all the kingdoms which were hostile to Penda. In =635= Wessex accepted Christianity, and the acceptance of Christianity brought with it the acceptance of Oswald's supremacy. Penda was thus surrounded by enemies, but his courage did not fail him, and in =642= at the battle of Maserfield he defeated Oswald. Oswald fell in the battle, begging with his last words for God's mercy on the souls of his enemies.