Tora Ziyal was the illegitimate daughter of the Cardassian Gul Dukat and the Bajoran Tora Naprem, conceived during the Occupation when Dukat was in command of Terok Nor.
Although Dukat loved both Naprem and their daughter, he knew the Occupation was drawing to a close and that Ziyal would not be accepted on either Bajor or Cardassia Prime. Therefore, he sent the two of them away to live on the neutral planet of Lissepia, aboard the transport ship Ravinok in 2366. En route, the Ravinok was attacked and downed on Dozaria by Breen warships. Naprem was killed in the crash, while Ziyal and the other survivors were captured and forced to labor in a nearby Breen dilithium mine.