St. Ninian is said to have studied in Rome, and, on his return journey, to have visited St. Martin, at Tours, who supplied him with masons to assist in the erection of a church, built of stone, in the Roman manner. This was known as the _Candida Casa_ (now Whithorn), which was built about the year 412, and dedicated to St. Martin of Tours. It became a great school of instruction in Christian doctrine,[1] but after a time the Christianity of this locality appears to have died out, or was transferred to Ireland. It is believed that some of the emissaries from this school in the fifth century may be traced in the dedications of churches amongst the Picts, as, for example, St. Ternan, at Banchory-Ternan; St. Mocholmoc, at Inchmahome; and St. Fillan, at the place named after him on Loch Earn. At Abernethy, in Perthshire, King Nectan is said to have been raised from the dead by St. Bœthius or Buitte, who came from Ireland, accompanied by St. Bridget and her ten virgins. The Saint, as a reward for his miracle, was presented with the fortress which existed at the place, just as the Irish ecclesiastics were established (as will be pointed out) by the chiefs in their raths or strongholds.[2] This king also built a church at Abernethy in honour of St. Bridget (about 480)--a foundation which afterwards became famous. [Illustration: FIG. 1.--Early Crosses near Whithorn.] It tends to confirm the truth of the early mission of St. Ninian to the Southern Picts, that the monumental stones which still survive in that region are engraved with incised crosses of the oldest form, and are accompanied with inscriptions in debased Roman capital letters, containing the formula “hic jacet”--all marks which indicate a very early date.[3] Such are the crosses near Whithorn and those at Kirkmadrine, in a neighbouring parish, which all bear the simple cross with equal arms enclosed in a circle,[4] and contain the chi-rho symbol. (Fig. 1.) It should further be noted that on the south coast of the Bay of Luce, not far from Whithorn, there exists a cave in the rocks which is believed to have been the retreat of an early Anchorite, perhaps of St. Ninian himself. Numerous crosses of early type, incised on the rocky walls and on the steps of a short stair leading down to the cave, prove that it has been occupied for religious purposes at an early date;[5] while on the Isle of Whithorn are the ruins of a church, which may possibly occupy the site of the original _Candida Casa_ of St. Ninian.[6] Another cave in the rocks on the shore of the opposite side of the Bay of Luce, still known as St. Medan’s Cave,[7] has also apparently served as the abode of an Anchorite. It consists, like the retreat of St. Cuthbert at Farne (to be afterwards described), of an oratory and an outer apartment for ordinary uses. Numerous similar caves, which have been used for the like sacred purpose, are still to be found in many parts of the country, particularly on the West Coast.