The name of the next abbot was Celredus, but of him nothing particular is recorded. He was succeeded by Hedda, in 833, during whose abbacy the first destruction of the monastery by the Danes occurred, which founded an important era in the history of this institution. A band of savage Danes, headed by Earl Hubba, invaded the territory of the Mercians, and after committing numerous depredations in the country, they plundered the monastery of Croyland, and proceeded to attack _Medeshamstede_. The monks of this abbey had, however, gained intelligence of their intentions, and having closed the gates, resolved to act on the defensive. Hubba and his desperadoes soon surrounded them, and demanded that the gates should be opened; and when he was told that he should not enter, he commenced to batter the walls. In the course of the attack, one of the monks hurled a great stone from the top of the building upon the besiegers, and Tulba, the brother of Hubba, was killed by it. This so incensed the earl, that he vowed to put every monk to death by his own hand; and having forced the gates, proceeded to put his horrible threat into execution,--robbed the monastery of everything that was valuable, and then set it on fire. It burned fifteen days. All the portable valuables were then packed on waggons and taken away. The plunder, however, is said to have been lost, "either in the Nen or in the neighbouring marshes."[2] This was in 870. In a short time a few monks who escaped at Croyland re-assembled at their abbey there, and after electing Godric their abbot, proceeded to _Medeshamstede_, and buried the monks of that monastery who had been murdered by the Danish invaders in one vast tomb. Godric likewise had their effigies cut out in stone (a representation of which is here shown, the original being in the Lady Chapel),[3] and, to honour their memory, he went every year to weep over the grave in which he had laid his brethren. From this time until the reign of Alfred the Great [872] the monastery of _Medeshamstede_ was frequently invaded, and the lands which belonged to it were seized by the conquerors. It was left for the wisdom and courage of Alfred to restore that tranquility to England which it had so long lost, and to give protection and security to his subjects. The Danes who had committed so many depredations before his accession to the throne were now beaten back and finally checked by the powerful fleet which he built to protect the kingdom from invasion. King Edgar, who succeeded Alfred, followed his example in this respect, and kept up the strength of the fleet. By this means increased security was given to England, and the people, comparatively happy in their internal government, and freed from the fear of foreign interruption, began to improve their public buildings and religious houses.