In 1159 John of Salisbury completed his two chief works, the _Metalogicus_ and the _Polycraticus_.[461] In the former he tells the interesting story of his education in the schools of northern France, and describes the teachers and methods of the humanistic school of Chartres and the schools of logic at Paris. This valuable picture of educational conditions in the middle of the twelfth century has already supplied us with a number of bits of information concerning authors of whom we have treated. Its importance in the history of the study of the classics and of scholasticism has long been recognized, and its content has often been reproduced in secondary works, so that we need not dwell upon it specifically here.[462] Moreover, although John spent some twelve years in his studies in France, he appears from his own statements to have passed from the study of logic and “grammar” to that of theology without devoting much attention to natural science,[463] although he received some instruction in the Quadrivium from Richard Bishop and Hardewin the Teuton. He was, it is true, according to his own statement, a pupil of William of Conches for three years, but he always alludes to William as a grammarian, not as a writer on natural philosophy and astronomy. This one-sided description of William’s teaching warns us not to place too implicit faith in John’s account of the learned world of his times. Even if reliable as it stands, it is not in itself a complete or adequate picture. In the _Polycraticus_, however, he engages in a rather long discussion of magic, astrology and other forms of divination which it behooves us to note. [Sidenote: Chief events of his life.] John tells us that he was a mere lad when in 1136 he first came from England to Gaul to hear the famous Abelard lecture. Like many medieval students, he was or soon came to be in a needy condition and eked out a living at one time by tutoring the sons of nobles. During the time that had elapsed between his long training in the liberal arts and theology and his writing of the _Metalogicus_ in 1159, he had led a busy life in the employ of Theobald, archbishop of Canterbury, crossing the Alps ten times, journeying twice all the way from England to Apulia, and frequently traveling about England and what is now France (John says, “the Gauls”--_Gallias_). In 1159 he addressed the _Polycraticus_ to Thomas Becket, then absent with Henry II as his chancellor at the siege of Toulouse. Thomas was just about John’s age and, before he became chancellor in 1154 at the age of thirty-six, had been like John first a student and then in the employ of Archbishop Theobald. John sided with Thomas Becket in the struggle with Henry II, retired to France, and returned to England with him in 1170. In 1176 he crowned his career by becoming bishop of Chartres where perhaps some years of his early studies had been spent. His death was in 1180. [Sidenote: General character of the _Polycraticus_.]