The book in which he described this episode was written by Patrick, as we shall see hereafter, when he was an old man. He rigidly omitted all details which did not bear upon his special purpose in writing it. The whole tale of his captivity and escape, undefined or vaguely defined by landmarks or seamarks, as if the places of the adventures had no name or lay beyond the range of all human charts, is designed to display exclusively the spiritual significance of those experiences. That the land of his captivity was Ireland, this was indeed significant; but otherwise names of men and places were of no concern and might be allowed to drop away. Patrick, in reviewing this critical period of his life, reproduces the select incidents as they impressed him at the moment, contributing, as he believed, to his own spiritual development, or illustrating the wonderful ways in which Heaven had dealt with him. CHAPTER III IN GAUL AND BRITAIN § 1. _At Lérins_ Patrick has not told us where, or in what circumstances, he parted from his companions, nor has he related his subsequent adventures. When he found himself free his first thought would have been, we should suppose, to make his way back to his home in Britain. We saw that he probably succeeded in escaping from his fellow-travellers in Italy, and his easiest way home might in that case have been by the coast road through Liguria and Provence to Marseilles. From whatever quarter he started, he seems to have reached the coast of Provence. For here at length, amid perplexing, broken clues, we have a definite trace of his path; here at length we can fix an episode in his life to a small plot of ground. [Sidenote: MONASTERY OF LERINUS]