Whithern (in Latin Casa Candida) probably derived its name from the white rough-casting with which the dark stone walls of this church were covered, a strange sight to Pictish eyes, accustomed only to wooden buildings.
The practice, now so general, of dedicating a church to a saint unconnected with the locality, was already current at Rome. But hitherto Britain had retained the more primitive habit, by which (if a church was associated with any particular name) it was called after the saint who first built or used it, or, like St. Alban's, the martyr who suffered on the spot. Besides Whithern, the church of Canterbury was dedicated about this time to St. Martin, showing the close ecclesiastical sympathy between Gaul and Britain.
The cave is on the northern shore of the Thuner-See, near Sundlauenen. Beatus is said to have introduced sailing into the Oberland by spreading his mantle to the steady breeze which blows down the lake by night and up it during the day. The name of Justus is preserved in the Justis-thal near Merlingen.
This name is merely the familiar Welsh Morgan, which signifies sea-born, done into Greek.