The English Church was vigorous from the very first. Ere it had been a hundred years in existence it had begun to produce men of such wisdom and piety, that England was considered the most saintly land of Western Christendom. It sent out the missionaries who rescued Germany from heathenism--Willibrord, the apostle of Frisia; Suidbert, who converted Hesse; above all the great Winfrith (or Boniface), the first Archbishop of Mainz. This great man, the friend and adviser of the Frankish ruler Charles Martel, spread the gospel all over Central Germany, and organized a national church in the lands on the Main and Saal, where previously Woden and his fellows alone had been worshipped. He died a martyr among the heathen of the Frisian Marshes in 733. Nor was the English Church less noted for its men of learning. Not only were they well versed in Latin, which was the common language of the clergy all over Europe, but some of them were skilled in Greek also, for the good Archbishop Theodore of Tarsus had instructed many in his native tongue. Among the old English scholars two deserve special mention: one is the Northumbrian Baeda (the Venerable Bede), a monk of Jarrow, who translated the Testament from Greek into English, and also wrote an ecclesiastical history of England which is our chief source for the knowledge of his times (d. 735); the second was another Northumbrian, Alcuin of York, whose knowledge was so celebrated all over Europe that the Emperor Charles the Great sent for him to Aachen, the Frankish capital, and made him his friend and tutor; for Charles ardently loved all manner of learning, and could find no one like Alcuin among his own people. [Sidenote: =Reign of Ecgfrith.--Decline of Northumbria.=] As long as Oswiu and his son Ecgfrith lived, Northumbria held the foremost place among the English kingdoms, and its rulers were accounted the chief kings of Britain. Ecgfrith conquered Carlisle and Cumbria from the Welsh, and even invaded Ireland, but in an attempt to add the highlands beyond the Forth to his realm, he was slain in battle by the Picts at Nechtansmere (685). With his death the greatness of Northumbria passed away, for his successors were weak men, and after a while grew so powerless that the kingdom was vexed by constant civil wars, and became the prey of its neighbours, the Mercians on the south, and the Picts and Scots on the north. [Illustration: ENGLAND in the 8{TH} CENTURY.] [Sidenote: =Supremacy of Mercia, 675-796.--Reign of Offa.=]