One event occurred during Dante’s youth, in which he is so generally believed to have borne a part, that it will probably come as a shock to many people to learn that this belief rests only on the statement of a writer who was not born till nearly fifty years after Dante’s death. On St. Barnabas’s day, June 11, 1289, the Florentine Guelfs met the Ghibelines of Arezzo, in whose ranks many of their own exiles were fighting, in a plain called Campaldino, belonging to the district of Certomondo, which lies in the Casentino, or upper part of the Arno valley. The Florentines gained a complete victory, though only after a hard fight, in which many of the chief Ghibeline leaders lost their lives. The event was one of great importance, and Villani recounts it in very full detail.[24] Dante also refers to it in one of the best-known passages of the _Purgatory_ (v. 92). It is quite possible that he himself may have taken part in the battle; but if he did so, it is somewhat strange that none of the earlier commentators, including his own son, nor any biographer of the fourteenth century, should have known of it, or, knowing of it, should have thought it worth recording; and that it should have been left to Leonardo Bruni of Arezzo, writing after the year 1400, to make the first reference to so noteworthy an incident in Dante’s early career. Leonardo (whose “Life” will be found in Bianchi’s edition of the _Commedia_) quotes, indeed, a letter, said to have been written many years afterwards by Dante, in which reference is made to his presence in the battle; but this letter has long disappeared, and it is to be noted that the biographer does not even profess to have seen it himself. There is, it must be said, in the _Hell_ (xxii. _init._) one allusion to warlike operations in the Aretine territory of which Dante claims to have been an eye-witness; but as none of the early commentators seems to refer to Campaldino in connection with this passage, it tells, if anything, against the received story.