or CISSUM, in Ancient Geography, a town of the Hither Spain, in Lusitania, on the east side of the Iberus (thought to be Guissona), where the Carthaginians were first defeated by Scipio. Another Cissa of Thrace, situated on the river Ægos Potamus, which Skylax seems to call Cressa, or Crissa; so that the reading is doubtful.