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Bible Encyclopedias
Summanus
1911 Encyclopedia Britannica
according to some, an old Sabine or Etruscan deity; the name, however, is Latin, formed by assimilation from sub-manus (cf. mane, Matuta), signifying the god of the time "before the morning." His sphere of influence was the nocturnal heavens, thunderstorms at night being attributed to him, those by day to Jupiter. Summanus had a temple at Rome near the Circus Maximus, dedicated at the time of the invasion of Italy by Pyrrhus, king of Epirus (278), when a terracotta image of the god (or of Jupiter himself) on the pediment of the Capitoline temple was struck by lightning and hurled into the river Tiber. Here sacrifice was offered every year to Summanus on the 10th of June, together with cakes called summanalia baked in the form of a wheel, supposed to be symbolical of the car of the god of the thunderbolt. In Plautus (Bacchides iv. 8, 54) Summanus and the verb summanare are used for the god of thieves and the act of stealing, with obvious reference to Summanus as a god of night, a time favourable to thieves and their business. The later explanation that Summanus is a contraction from Summus Manium (the greatest of the Manes), and that he is to be identified with Dis Pater, is now generally rejected.
See Augustine, De civitate dei, iv. 23; Ovid, Fasti, vi. 729; Festus, s.v. Provorsum fulgor; G. Wissowa, Religion and Kultus der Romer (1902); W. W. Fowler, The Roman Festivals (1899).
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Chisholm, Hugh, General Editor. Entry for 'Summanus'. 1911 Encyclopedia Britanica. https://www.studylight.org/​encyclopedias/​eng/​bri/​s/summanus.html. 1910.