Cassandra or Kassandra (Ancient Greek: Κασσάνδρα, pronounced [kas:ándra], also Κασάνδρα), (sometimes referred to as Alexandra), was a Trojan priestess of Apollo in Greek mythology cursed to utter true prophecies, but never to be believed. In modern usage her name is employed as a rhetorical device to indicate someone whose accurate prophecies are not believed. Wikipedia
A Cassandra is a kind of Soothsayers