After holding this situation for about three years, Buchanan went with Govea, at the instance of the King of Portugal, to a lately established school at Coimbra. Before he ventured into Portugal, however, he took care to let the King know that his Franciscanus was undertaken at the command of his sovereign, and therefore ought nowise to endanger his safety in Portugal. The King promised him his protection. But he had not been at Coimbra long, before he was accused by the monks of heresy, and the King, forgetting his promise, allowed them to keep Buchanan prisoner in a convent, as they declared, for the purpose of reclaiming him. They gave him as a penance the task of translating the Psalms of David from the Vulgate into Latin verse. This he accomplished to admiration; and his production is acknowledged to surpass all works of the like sort. The metres are chiefly lyrical. He was soon after dismissed from prison, and took ship for England, and staying there but a short time, he returned again to France. Here the Marechal de Brissac intrusted him with the education of his son Timoleon de Cossé. While thus employed he studied, more particularly than he had hitherto done, the controversies of the day with regard to religion, and became most probably a confirmed protestant, though he did not openly renounce catholicism till some time afterwards. He wrote, and dedicated to his pupil, a much admired piece, entitled ‘Sphœra,’ during his tutorship. In the year 1560 he returned again to Scotland, the reformed religion being then prevalent there, and became publicly a member of the Protestant Kirk. The most important, because the most public part of Buchanan’s life now begins. Such a man could not long remain unnoticed by the great in Scotland, and Mary Stuart herself became one of his best friends. He had written for her two epithalamia, one on her marriage with the Dauphin, and one on her marriage with Lord Darnley. Her respect for his abilities was very great, and she had him appointed tutor to her son a month after he was born, in the year 1566.