Upon the completion of the Valens Waterway, Themistius celebrated the arrival of the water as follows: "...And roofed over they come together and they have arrived here before the gates and they camp in the open waiting for the originator in order that with him as host they might settle in their temple, in which dance together Hephaestus and Asclepius and Panacea."
According to Crow et al., 2008, p. 10, the 'temple' is the great nymphaeum constructed by the prefect Clearchus.