A daughter of Laomedon and Placia or Leucippe, and a sister of Priam. At the time when Hecabe was pregnant with Paris, the seer Aesacus declared that mother and child must be put to death in order to avert a great calamity; but Priam, who referred this prophetic declaration to Cilla and her son Munippus by Thymoetus, made them suffer instead of Hecabe and Paris. (Apollod. iii. 12. § 8; Tzetz. ad Lycoph. 224.)