Are there literary attestations of werewolves in the Classical period?

Question

The modern idea of werewolves seems to have arisen somewhere in the Middle Ages, after the spread of Christianity. But I vaguely remember a story in the Satyricon (specifically at Trimalchio's dinner) about a man turning into a wolf at the full moon.

Are there other stories of people transforming into wolves from Classical or pre-Classical times? (And back again: while Ovid writes about a lot of transformations, they're generally permanent.)

Answer 1

Here's an example I remember, Verg., Ecl., 8, 96

Has herbas atque haec Ponto mihi lecta venena
ipse dedit Moeris; nascuntur plurima Ponto.
His ego saepe lupum fieri et se condere silvis
Moerim [...]

Lit. Moeris himself gave me these herbs and choice Pontian potions (they are abundantly growing in Pontus). I saw myself not once how Moeris turned himself with them into a wolf and ran into the woods...

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Here is another (late 4th c.) mention, not known, AFAIK, from other sources, of Apollo Lyceus living with Cyrene in the shape of a wolf, assuming gods (and 4th c. sources) also qualify (Serv. Hon., A., 4.377):

Apollinem Lyceum appellari dicunt sive de Lyco, quem vicit, et in victoriae suae testimonium hoc nomen induit [...] sive quod transfiguratus in lupum cum Cyrene concubuit: sive quod in lupi habitu Telchinas occiderit...