After the death of Canute in 1035, it became a question whether this same Alfred, "the Etheling" (i.e. Prince), Emma's eldest son by Ethelred, now a man of over thirty, or Harthacnut, her only son by Canute, a boy of sixteen, or one Harold, who, though not an Etheling, claimed to be Canute's eldest son, should be chosen King of England. Harold, in spite of grave doubts as to his paternity, "had all the cry"; and when Alfred, "the innocent Etheling," made an attempt to protect his widowed mother against the new King's oppression, he was sent as a prisoner by ship to Ely. Before being landed his eyes were put out, in a manner so brutal that he shortly died of the shock, to find a grave in the Abbey church under its western tower. The Anglo-Saxon Chronicler records this crime in a pathetic ballad, denouncing it as even beyond the horrors of the Danish wars:

"Nor was drearier deed
Done in this land,
Since Danes first came."

That no blame need be attached to the monks of Ely for this atrocity is indicated by the fact that, when Alfred's brother, Edward the Confessor, came to the throne, he confirmed all their ancient charters, granting lands and privileges to the Abbey, and himself became a benefactor to the place of his education.

With the Norman invasion, Ely again becomes a centre of war. Led by Christian the Bishop, and Osbiorn the Earl, a force of Danish adventurers had appeared in the Humber, professing to be the allies of the English in their struggle with the Normans. Their real object was to place their own King Sweyn, the nephew of Canute, on the throne of England, and, if foiled in this purpose, at least to enrich themselves with England's plunder. After partaking in scenes of devastation in Yorkshire, they sailed southward till they reached Ely, where they took up their quarters. Here the fenland folk forgathered with them, for the Norman was a more thoroughgoing oppressor than any Dane; and, in especial, the "strenuous" outlaw Hereward "the Wake" joined them "with his gang."

To show their zeal against the French—and to indulge their lust of plunder—they set off, by water, to Peterborough, where the Abbey had been recently conferred on a Norman ruffian named Thorold. To save this good old English foundation from such degrading occupancy, Hereward, as their guide, led them on, first to sack and then to burn it to the ground. The Danes, having got their booty, promptly sailed away, while Hereward returned to Ely, there to make his memorable stand against William and the Normans. Fiction may have embroidered the tale of his prowess; but there remains a foundation of truth, even after the superstructure of romance has been removed. At Ely were now gathered together to him a mixed company of fugitives; misfortune, according to her repute, making strange bed-fellows.

When William had conquered at Hastings, England, as a whole, was at first disposed to accept the verdict of battle, and to acknowledge his claim to the throne, as it had acknowledged Canute's. But when the necessities of his position, as the captain of an invading army, forced him to confiscate every estate in England (except the Church lands), and to bestow it on some Norman adventurer; when every single Englishman in high office, Sheriff and Alderman, Bishop and Abbot, was turned out to make room for a Frenchman,[211] the whole nation glowed with outraged patriotism, and Ely seemed likely to become a second Athelney, whence the spark of resistance to the tyrant might spread like wildfire throughout the length and breadth of the land.

And had there been a second Alfred this might well have actually come to pass. As it was, many of the magnates who could not brook submission retired to the "Camp of Refuge," as the Island of Ely now got to be called. This fastness, being surrounded on all sides by deep fens "as by a strong wall," promised them a sure retreat, and for a while enabled them to baffle all the efforts even of the mighty Conqueror to subdue them. Thither came Archbishop Stigand (deposed by the Conqueror to make way for the great Lanfranc); thither came the Abbot of St. Albans, thither came the valiant Ethelnoth, Bishop of Durham; thither came Morcar, the last Earl of Northumbria, "with many a hundred more," both clergy and laity. Here they received shelter and hospitality from Thurstan, the last of the English Abbots of Ely.

By the general voice Hereward was chosen as their captain, and fortified the island against the Conqueror. William, on hearing of this, hastened to Cambridge with his whole army, and invested the place (so far as it was possible to invest it) both by land and water, building a castle at Wisbech on the north, and at Reach on the south. At Aldreth, where scarcely a mile of fen parted the Island from the mainland at Willingham, he made a floating bridge of trees and faggots, fastened underneath with cow-hides; but when his men attempted to cross it, the unsteady structure capsized, and that portion of the army engaged in the attempt was drowned.

Perplexed and almost daunted, William, with his court and army, retired for a time to Brandon in Suffolk; while the refugees at Ely spent stirring days. The knights and churchmen were hospitably entertained in the refectory of the abbey, every man with his shield and lance hanging near him, to be ready in case of sudden alarm. Their days were diversified by raids into the surrounding country beyond the fens, to snatch what provisions they could for their fastness; and these raids of the islanders were so dreaded throughout the district, that its inhabitants were thankful for the protection of William's soldiery.

Hereward, according to the legend, hearing that another attack was imminent, followed the example of Alfred the Great by betaking himself in disguise to Brandon to learn the King's designs. He found that William, by a judicious mixture of severity and conciliation, had won over a certain number of the outlying fen-folk, and had imposed upon them the task of conveying a great store of wood and faggots for him to Aldreth, with which to construct there a causeway once more. Hereupon Hereward, still in his disguise, feigned that he was himself one of these traitors to England, and eager above all the others to help the Conqueror against the marauding thieves of the Camp of Refuge. It was he who was foremost in collecting faggots for the wood-pile at Aldreth, and then, when all was gathered, who was it but Hereward that set it on fire so that all was lost? And once more, when the besiegers were making a third attempt to gain the island, under the auspices of a reputed witch whom the pious William deigned to employ for the sustaining of his men's sunken courage, it was Hereward who fired the reed-beds through which the foe was advancing, so that the whole column, witch and all, were involved in one common destruction.