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 to the Christian dead. Nothing, however, is known of her history.

Two martyrs, SS. Felix and Adauctus, once well known in Christian story, were interred here. They belong to the time of Diocletian. This Catacomb, apparently of considerable extent, is only very imperfectly known. The Martyrologies mention other "confessors" buried here, but the corridors are either earthed up or are in a state of ruin and confusion, and any thorough investigation would be a costly and difficult piece of work.

(3) Cemetery of S. Thekla.—Nothing is known of the martyr who has given her name to this Catacomb; who must not, however, be confounded with the celebrated saint of the same name who belongs to Lycaonia, and is traditionally connected with S. Paul. This cemetery has been but imperfectly examined as yet; its extent is unknown.

The Via Ardeatina lies a little distance to the right of the Via Appia, from which it branches off close to the Church of "Domine quo vadis," the traditional scene of the appearance of the Lord to S. Peter. In the immediate neighbourhood of the Via Ardeatina and the Via Appia lie, roughly speaking scarcely two miles from the city, the wonderful group of cemeteries generally known under the names of Domitilla and Callistus. These include the Cemetery of Lucina—really an area of Callistus, the Cemeteries of SS. Marcus and Balbinus and also that of S. Soteris. This enormous network of subterranean corridors, chambers, and chapels are all more or less united by passages and corridors (though this is not quite certain); but much is as yet unexplored, and the lines of demarcation between the several Catacombs uncertain. Recent careful investigations of De Rossi, Armellini, Marucchi, and others less known have, however, led to the discovery of certain great and notable historic crypts, centres round which the network of corridors are grouped. These identifications have thrown a flood of light upon the very early history of the numerous and influential Roman congregations; much that