only brought down to the end of the thirteenth century, and items of Florentine history had increased in number and extent, so it came about that all these additions forsook universal history and were solely devoted to that of Florence. In this way the former merely served, as it were, as an introduction to the latter; a result highly gratifying to municipal self-complacency. One of the first works introducing Martin Polono's book, translated, shortened, re-written, and with several interpolated Florentine items, is that entitled "Le Vite dei Pontefici et Imperatori Romani," once attributed to Petrarch, and existing in several Florentine fourteenth-century codices. In this work, however, Florentine history is still given very secondary importance, and indeed when at last, after various sequels and alterations, it finally appeared in print in 1478, Polono's primitive method was still maintained by giving summaries here and there of the lives of the other emperors and Popes. But other versions soon appeared in which Florentine history filled a larger space.[29] In a fourteenth-century MS. of the Naples National Library, first examined by Pertz, we find Martin Polono's share of the work considerably curtailed, and the history of Florence not only much extended, but likewise carried down to 1309.[30] Here one begins to see that the writer was chiefly interested in Florentine events. Professor Hartwig was so struck by this fact as to be at the pains to extract everything relating to Florence from the MS., and print it apart, as one of the authorities probably recurred to by Villani.[31] In a chronicle attributed to Brunetto Latini the same purpose is still more clearly indicated. Some of the Florentine news contained in it were long and frequently extracted, printed, and employed; notably the list of Consuls and Podestà used by Ammirato, and a narrative of the Buondelmonti tragedy (1215), differing considerably from Villani's version of the tale. It was speedily decided that the author must have written in 1293, since he records an event of that year, and says that he witnessed it with his own eyes.[32] Later, this Chronicle was attributed to Brunetto Latini, although the narrative is carried down to a date when Dante's master must have certainly ceased to exist.[33] During his learned researches in Florence Dr. Hartwig discovered a MS. that, in all probability, is the original autograph of the Chronicle.[34] Although mutilated--starting only from 1181--this Codex is doubly precious, as it clearly shows the method on which this and many similar works were compiled. There is a middle column containing the usual mangled version of Martin Polono[35]; and here on the margins, between the rubrics and sometimes even the lines, are added notices of general history, drawn from other sources, and special records of Florentine events.