1883.--Backhouse and Taylor: _History of the primitive Church._
(Italian edition.) Rome, Loescher, 1890.--Greppo: _Trois memoires
relatifs a l'histoire ecclesiastique._--Doellinger: _Christenthum und
Kirche._--Champagny (Comte de): _Les Antonins_, vol. i.--Gaston
Boissier: _La fin du paganisme_, etc., 2 vols. Paris, Hachette,
1891.--Giovanni Marangoni: _Delle cose gentilesche trasportate ad uso
delle chiese._ Roma, Pagliarini, 1744.--Mosheim: _De rebus Christianis
ante Constantinum._--Carlo Fea: _Dissertazione sulle rovine di Roma_,
in Winckelmann's _Storia delle arti._ Roma, Pagliarini, 1783, vol.
iii.--Louis Duchesne: _Le liber pontificalis._ Paris, Thorin,
1886-1892.--G. B. de Rossi: _Bullettino di archeologia cristiana._
Roma, Salviucci, 1863-1891.

[2] See de Rossi: _Bullettino di archeologia cristiana_, 1888-1889, p.
15; 1890, p. 97.--Edmond Le Blant: _Comptes rendus de l'Acad. des
Inscript._, 1888, p. 113.--Arthur Frothingham: _American Journal of
Archaeology_, June, 1888, p. 214.--R. Lanciani: _Gli horti Aciliorum
sul Pincio_, in the _Bullettino della commissione archeologica_, 1891,
p. 132; _Underground Christian Rome_, in the _Atlantic Monthly_, July,
1891.

[3] See Ersilia Lovatelli: _Il Monte Pincio_, in the _Miscellanea
archeologica_, p. 211.--Rodolfo Lanciani: _Su gli orti degli Acili sul
Pincio_, in the _Bullettino di corrispondenza archeologica_, 1868, p.
132.

[4] A description of the beautiful villa of Herodes, adjoining the
Catacombs of Praetextatus, will be found in chapter vi. pp. 287 sqq.

[5] A _consul suffectus_ was one elected as a substitute in case of
the death or retirement of one of the regular consuls.

[6] Lampridius, in _Sev. Alex._, c. 43.

[7] In chapter v., p. 122, of _Ancient Rome_, I have attributed these
_graffiti_ to the second half of the first century; but after a
careful examination of the structure of the wall, on the plaster of
which they are scratched, I am convinced that they must have been
written towards the end of the second century.

[8] Orelli, 4024, _Digest L._, iv. 18, 7.

[9] See Ulpian: _De officio Procons._, i. 3.

[10] Lampridius, _Heliog._, 3.

[11] See Greppo: _Memoire sur les laraires de l'empereur Alexandre
Severe_.

[12] The name of the villa was _Cassiacum_; its memory has lasted to
the present age. See the memoir of Luigi Biraghi, _S. Agostino a
Cassago di Brianza._ Milano, 1854.

[13] See _Bullettino di archeologia cristiana_, 1865, p. 50