E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
A sweetheart. An old flame, a quondam sweetheart. In Latin, flamma is used for love, and so is feu in French. Ardeo, to burn like fire, is also applied to the passion of love; hence, Virgil (Ecl. ii. 4), Corydon ardebat Alexin; and Horace (Epoch xiii. 9), Arsit Anacreon Bathyllo.