The Hellespontine Sibyl was the priestess presiding over the Apollonian oracle at Dardania. The Sibyl is sometimes referred to as the Trojan Sibyl.

The word Sibyl comes (via Latin) from the ancient Greek word sibylla, meaning prophetess. There were many Sibyls in the ancient world but this Sibyl is known for her prediction of the Crucifixion, and is usually shown standing beside a Cross.

The Hellespontian Sibyl was born in the village of Marpessus near the small town of Gergitha , during the lifetimes of Solon and Cyrus the Great. Marpessus, according to Heraclides of Pontus, was formerly within the boundaries of the Troad.

The sibylline collection at Gergis was attributed to the Hellespontine Sibyl and was preserved in the temple of Apollo at Gergis. Thence it passed to Erythrae, where it became famous.