A son of Achilles and the Amazon Penthesilea, from whom the river Caystrus was believed to have derived its name. Caystrius, together with Asius, had a heroum on the banks of that river.
- Servius on Virgil's Aeneid xii, 661.
- Smith, William. (1870). Dictionary of Greek and Roman Biography and Mythology. London: Taylor, Walton, and Maberly.
- Strabo. Geography xiv, p. 650.
This article incorporates text from Dictionary of Greek and Roman Biography and Mythology (1870) by William Smith, which is in the public domain.