Ezri Dax was a joined Trill and the ninth host of the Dax symbiont. She served as counselor aboard Deep Space 9 (Imperia Nolus), beginning in 2375. She was joined to Dax shortly after the death of its previous host, Jadzia. Dax, formerly Ezri Tigan, was born on New Sydney. Her mother was a successful mining magnate, and she and Ezri disagreed on many occasions. Her father was often absent – Ezri noted it was because he couldn't bear to be around his wife.