Meantime the kinglets made war with each other, and London became a prize for each in turn. It passed from the East Saxon to the Northumbrian, to the Mercian, to the West Saxon, as the hegemony passed from one to the other. Each kinglet learned more and more to recognize its importance and its value. One of the oldest civic documents extant is a grant of King Ethelbald to the Bishop of Rochester. He gives him the right of passing one ship of his own, or of another's, free of toll into the port of London. The toll of incoming and outgoing vessels formed, therefore, part of the royal revenue. The history of London between A.D. 600 and the Norman Conquest is the history of England. How the City fell into the hands of the Danes, how it was finally secured by Alfred, how the Danes again obtained the City without fighting, and how the Norman was received in peace, belong to history. All this time London was steadily growing. Whatever king sat on the throne, her trade increased, and her wealth. The buildings, till long after the Norman Conquest, were small and mean: the better houses were timber frames, with shutters or lattices, but no glass for the windows; the poorer houses were of wattle and daub. The churches were numerous and small. Some of them were still of wood, though a few were built of stone, with the simple circular arch. The first church of St. Paul's was destroyed by fire, a fate which awaited the second and the third. By the time of Edward the Confessor the second church was completed; but of this church we have no record whatever. The Saxon period, as concerns London, is the darkest of any. You may see at the Guildhall nearly everything that remains of Roman London. But there is nothing, absolutely not one single stone, to illustrate Saxon London. The city which grew up over the deserted Augusta and flourished for four hundred years has entirely disappeared. Nothing is left of it at all. The chief destroyer of Saxon London was the great fire of 1135, which swept London from end to end as effectually as that of 1666. Had it not been for these two fires, we should very likely have still standing one or two of the sturdy little Saxon churches of which the country yet affords one surviving example. Yet London is not alone in having no monuments of this period. If we take any other town, what remains in it of the years A.D. 600-1000? What is left in Rome to mark the reigns of the eighty Popes who fill that period? What in Paris to illustrate the rule of the Carlovingians? Fire and the piety of successive generations have destroyed all the buildings.