Book of the saints, 1966 (Hippolytus, Concordia; d. ca. 236; Hippolytus of Porto, really the same as Hippolytus of Rome; the 2 are often confused as different men)
Hanssens, J. M. La liturgie d'Hippolyte, 1965 t.p. (Hippolyte)
Holweck, F. G. Biog. dict. of the saints, 1924 (Hippolytus; martyr, bishop and ecclesiastical writer, called Pope of Rome by the Greeks and Bishop of Portus Romanus by others; the Cath. Church venerates him as Bishop of Porto Romano; d. 235)
New Cath. encycl., c1967 (Hippolytus of Rome, St., b. ca. 170, d. 235 or 236; Roman priest & antipope, opposed Pope Callistus I and was elected antipope by a circle of followers in 217. Reconciled with Pope Pontianus in 235 and resigned as antipope. Martyred with Pontianus in Sardinia)
nuc89-90602: His La tradición apostólica, 1986 (hdg. on IObT rept.: Hippolytus, Antipope, ca. 170-235 or 6; usage: Hipólite de Roma)
Vagianos, G.S. To zētēma tou vaptismatos tōn pallakikōn ... 1990 t.p. (Hippolyto) p. 518 (Hippolytos)
Visonà, G. Pseudo Ippolito, In sanctum Pascha, 1988 p. 25, etc. (Pseudo-Hippolytus, name under which currently identified the author of the homily In sanctum Pascha discovered by Martin in 1926 and thought by some to be a later text based on the lost homily of Hippolytus of Rome)
