Passage 8.47.1
τὸ δὲ ἄγαλμα ἐν Τεγέᾳ τὸ ἐφʼ ἡμῶν ἐκομίσθη μὲν ἐκ δήμου τοῦ Μανθουρέων, Ἱππία δὲ παρὰ τοῖς Μανθουρεῦσιν εἶχεν ἐπίκλησιν, ὅτι τῷ ἐκείνων λόγῳ γινομένης τοῖς θεοῖς πρὸς γίγαντας μάχης ἐπήλασεν Ἐγκελάδῳ ἵππων τὸ ἅρμα· Ἀλέαν μέντοι καλεῖσθαι καὶ ταύτην ἔς τε Ἕλληνας τοὺς ἄλλους καὶ ἐς αὐτοὺς Πελοποννησίους ἐκνενίκηκε. τῷ δὲ ἀγάλματι τῆς Ἀθηνᾶς τῇ μὲν Ἀσκληπιός, τῇ δὲ Ὑγείᾳ παρεστῶσά ἐστι λίθου τοῦ Πεντελησίου, Σκόπα δὲ ἔργα Παρίου.
The statue at Tegea in our day was brought there from the township of Manthurea. Among the Manthureans it had the surname Hippia, because, according to their tradition, during the battle between the gods and the giants, Athena drove her chariot and horses against Enkelados. Nevertheless, the name Alea prevailed as the standard usage among other Greeks as well as the Peloponnesians themselves. Beside this statue of Athena stand images of Asclepius on one side, and Hygieia on the other, both made from Pentelic marble and works of Skopas of Paros.