is designated Marmorarius in an extant inscription, found at Cadiz, which records the accomplishment of a vow which he had made to erect in the temple of Minerva a Theostasis decorated with marbles, wrought by his own hand (Muratori, Thes. vol. i. p. 125.2; Orelli, Inscrip. Lat. Sel. No. 2507). It is doubtful whether the word Marmorarius signifies a sculptor, or a common worker in marble. Raoul-Rochette quotes a passage from Seneca (Epist. 88), in which it appears to have the former sense; and, of course, if such be its meaning in this inscription, the name of Syntrophus must be added to the lists of ancient artists. (R. Rochette, Lettre à M. Schorn, pp. 411. 412, 2d ed.)
[P.S]A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890