2. A surname of Apollo at Thebes, who had a temple on the river Ismenus. (Paus. 2.10.4, 4.27.4, 9.10. §§ 2, 5.) The sanctuary of the god, at which the Daphnephoria was celebrated, bore the name of Ismenium, and was situated outside the city.
[L.S]A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890