Lewis & Short

Cylōnīus or -ēus, a, um, adj., = Κυλώνειος, pertaining to Cylon, the well-known Athenian: scelus = ἄγος Κυλώνειον, the crime committed by the murder of Cylon’s partisans at the altar of Athene, where they had sought asylum, Cic. Leg. 2, 11, 28.