The contemporary Eginhard tells us that the king invaded Spain at the head of a huge army, pushed on as far as Saragossa, and there received hostages from the Saracen chiefs. On his return, whilst entangled in the Pyrenean pass, the Basques attacked his rearguard, which perished to a man. Most of the officers of the palace, to whom Charlemagne had confided the command of the troops, were among the slain, and with them “Roland, prefect of the Marches of Brittany.” No revenge could be taken for this disaster, as the light-footed mountaineers dispersed, and could not be reached. This is all we know for certain, but even in this account the existence of Roland among the captains slain is doubtful, as the passage referring to him is an interpolation, and is not found in the best MSS. copies. In 810 Louis “le Debonaire,” at that time King of Aquitaine, on his return from an expedition into Spain, took the precaution of securing the wives and children of the Basques and retaining them as hostages till he was safely through the pass. But in 824 the Frank army descended to Pampeluna, under two counts, and on its way back was surprised at Roncevaux by the Basques; the troops were slaughtered and the counts taken. These two disasters in popular tradition were run into one, and gave occasion to the composition of the “Song of Roland,” one of the finest pieces of medieval poetry that we possess. “‘The Song of Roland,’” says Mr. Ludlow, “apart from any question of literary merit, has a peculiar interest for our country, not only as forming one of the treasures of the Bodleian, but from its connexion with one of the half dozen greatest events in our history--the Battle of Hastings. For there, as we are told by Wace, William of Normandy’s minstrel ‘Taillefer who full well sang, on a horse that was swift, went before them singing _Of Charlemagne and of Roland, and of Oliver and of the vassals who died at Roncevaux_.’”[E] [E] Ludlow, _Popular Epics of the Middle Ages_. London, 1865. The very earliest text extant of this poem is in the Bodleian Library at Oxford. All other songs of Roland are amplifications of later date. Thus it appears that to the chanting of this ballad by a minstrel William went forward to the conquest of England. One of the most popular books of the Middle Ages was the _History of the Life of Charlemagne and of his Nephew Roland_, which passed as the composition of Turpin, Archbishop of Rheims, a man who died about 800. It was a historical romance based on old ballads, composed in the twelfth century, and of no historic value whatsoever. Pope Callixtus II formally decided, however, in 1122, that it was veracious history.