Greek Anthology Book XIV: 20. - Enigma

Enigma

 * If you put one hundred in the middle of a burning fire, you will find the son and slayer of a virgin.

Solution
Pyrrhus, son of Deidamia, and slayer of Polyxena.

The Greek letter $\rho$ (rho) is the symbol for $100$ in the classical number system of ancient Greece

The word for fire in ancient Greek was $\pi \upsilon \rho \acute \omicron \varsigma$ (that is, pyros).

Inserting $\rho$ into $\pi \upsilon \rho \acute \omicron \varsigma$ gives $\pi \upsilon \rho rho \acute \omicron \varsigma$, which is a rendition of Pyrrhus.