The Sturlung history, which is the close of the heroic literature of Iceland, has resemblances to the work of all three of the historians just named. It is like Ari in its minuteness and accuracy; like _Sverris Saga_, it has a contemporary subject to treat of; and it shares with Snorri his spirit of vivid narrative and his sympathy with the methods of the greater Sagas of Iceland. If authors were to be judged by the difficulty of their undertakings, then Sturla, the writer of the Sturlung history, would certainly come out as the greatest of them all. For he was limited by known facts as much, or even more than Ari; while he has given to his record of factions, feuds, and anarchy almost as much spirit as Snorri gave to his lives of the heroic kings, and more than Abbot Karl could give to the history of Sverre and his political success. At the same time, however, the difficulty of Sturla's work had been a good deal reduced in the gradual progress of Icelandic literature. He had to represent modern history, the history of his own time, in the form and with the vividness of the imaginative Sagas. In undertaking this he was helped by some examples of the same sort of thing, in Sagas written before his time, and forming an intermediate stage between the group of which _Njála_ is the head, and Sturla's history of his own family. The biographies of Icelanders in the twelfth century, like that of Thorgils and Haflidi quoted above, which form an introduction to the Sturlung history, are something more authentic than the heroic Sagas, but not much less spirited. It is difficult to draw a decided line anywhere between the different classes; or, except by the date of its subject, to mark off the story of the heroic age from the story of the rather less heroic age that followed it. There was apparently an accommodation of the Saga form to modern subjects, effected through a number of experiments, with a result, complete and admirable, in Sturla's history of the Sturlung fortunes.