The name "Ruspe" is treated as a Greek feminine singular word equivalent to Latin "Ruspa" by Henricus de Noris, and is the form used in a list of dioceses that the Greek Patriarchate of Alexandria saw as dependent on itself at the beginning of the 8th century.
The Tabula Peutingeriana gives as coastal towns in the Byzacena region Ruspina and Ruspe, the latter being to the south of the former. Ptolemy's Geography mentions the same two towns in the same order (Stevenson's admittedly defective English translation of Ptolemy gives instead Ruspina and Rheuspena).
According to the Tabula Peutingeriana, Ruspe was situated between Acholla and Usilla, near the promontory that Ptolemy called Brachodes, the Caput Vadorum of the Romans, later Capaudia, Qaboudia in Arabic (cf. Chebba). The name "Ruspe" is interpreted as including the Semitic element rus, meaning "head" or "headland". It is thus commonly identified with the ruins known as Henchir Sbia (or simply Sbia) in present-day Tunisia, four miles west of that cape. An alternative site is that of the ruins known as Ksour Siad.
In the mid-20th century, a new argument emerged in favour of Koudiat Rosfa, 30 kilometres north of Sfax, because of the discovery in 1947 of an inscription at Henchir Bou Tria that seems to identify that place with ancient Acholla. (Saumagne had earlier proposed to identify it with Ruspe.) A nearby headland is called Rass Bou Tria. This identification of Acholla gives grounds for considering Ptolemy mistaken in placing Acholla and Usilla north of Cape Brachodes, and for identifying Ruspe as Koudiat Rosfa, which is seen as having preserved the ancient name in an Arabic form. Excavations at Koudiat Rosfa have not confirmed the perhaps flattering description applied to the city by Fulgentius's biographer Ferrandus: nobile oppidum clarissimis habitatoribus prorsus illustre (a noble town illustrious for its famous inhabitants).
Bishops of Ruspe earlier than Fulgentius whose names are known are Secundus, who was at the Conference of Carthage in 411 that brought together Catholic and Donatist bishops – Morcelli assigns him instead to an otherwise unknown diocese of Ruspina – and Stephanus, one of the Catholic bishops whom the Arian Vandal king Huneric summoned to Carthage in 484 and then exiled. The immediate successor of Fulgentius was Felicianus, his companion in exile, who participated in a council held at Carthage in 534. In 646, Iulianus was at an anti-Monothelitism council in the same city.
- Henricus de Noris in Migne's Supplement to the Works of Augustine, Patrologia Latina, vol. 47, col. 297B
- J. Mesnage, L'Afrique chrétienne, Paris 1912, pp. 140–141
- Alexander MacBean, Samuel Johnson, A Dictionary of Ancient Geography (G. Robinson, 1773)
- William Smith, Dictionary of Greek and Roman Geography (1854)
- Stefano Antonio Morcelli, Africa christiana, Volume I, Brescia 1816, pp. 265–266
- Annuario Pontificio 2013 (Libreria Editrice Vaticana 2013 ISBN 978-88-209-9070-1), p. 961
- Image of section of the Tabula Peutingeriana with Ruspe
- Book IV, Chapter 3
- G. Ch. Picard, "Ruspe" in Enciclopedia dell'Arte Antica (Treccani 1965)
- Edward Gibbon, The History of the Decline and Fall of the Roman Empire, 5 (Baudry's European Library, 1840), chapter 41, footnote 15
- Sophrone Pétridès, "Ruspe" in Catholic Encyclopedia (New York 1912)
- The Princeton Encyclopedia of Classical Sites (1976)
- Henchir Bou Tria: Tunisia
- Rass Bou Tria