The monastic writers remain our chief authorities until the great change brought about by the invention of printing, although a certain amount of work was done by clerical writers attached to the courts of various rulers. Parallel with this event the revival of learning was producing a great number of men who could write, and, more important still, of men who were throwing off the monastic habits of thought and passing into a new intellectual atmosphere. The Renaissance was followed by the fierce controversies aroused by the Reformation, and the result was the output of an enormous mass of writings covering every phase of the mighty combat and possessing every literary virtue save that of impartiality. But apart from these polemical writings, many of which had only an ephemeral value, the Renaissance was the source of another stream of historical literature. Several princes and other leading personages, foremost among whom was the emperor Maximilian I., had spent a good deal of time and money in collecting the manuscripts of the medieval chroniclers, and these now began to be printed. The chronicle of Otto of Freising, which appeared in 1515, and the _Vita_ of Einhard, which appeared six years later, are only two among the many printed at this time. The publication of collections of chronicles began in 1529, and the uncritical fashion in which these were reproduced made forgeries easy and frequent. There was, indeed, more than a zeal for pure learning behind this new movement; for both parties in the great religious controversy of the time used these records of the past as a storehouse of weapons of offence. The Protestants eagerly sought out the writings which exposed and denounced the arrogance of the popes, while the Romanists attempted to counter them with the numerous lives of the saints.