(Κτήσυλλα), a beautiful maiden of the island of Cos, of whom and Hermochares Antoninus Liberalis (Met. 1) relates nearly the same story which other writers relate of Cydippe and Acontius. [ACONTIUS.] Buttmann (Mythol. ii. p. 135, &c.) thinks that Ctesylla was originally an attribute of some ancient national divinity at Ceos--Aphrodite Ctesylla was worshipped there--who was believed to have had some love affair with a mortal.
[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