This article describes the water monuments of benefactor Gaius Stertinius Xenophon at the Sanctuary of Asklepios at Kos in the first century CE. After his travels to Rome, Xenophon renovated the existing monuments of the sanctuary. He ornamented the Hellenistic arcuated retaining wall with the water channel carrying water from the springs of Bourina to meet the purificatory and healing needs of Asklepian patients. I demonstrate that with the addition of water, the Hellenistic arcuated wall makes ...