Acontius, a youth from the Greek island of Keos, fell in love with an Athenian girl, Cydippe, who was of higher social standing than he. In order to win her, he inscribed the words 'I swear before Artemis to marry none but Acontius' on an apple (or orange, depending on the text) and threw it in front of her. Cydippe picked up the fruit and read the inscription aloud, which bound her to the vow. Thereafter, whenever her parents found a suitable prospective husband, Cydippe fell so ill that the marriage had to be called off. Eventually her parents consulted an oracle, which revealed the truth, and Cydippe was allowed to marry Acontius.
This particular tapestry shows Acontius on the right, with Cupid watching, as Cydippe in the centre, having picked up the fruit, reads the inscription.