Curzon Dax Curzon Dax was a joined Trill and the seventh host of the from 2286 to 2367 . Biography . Curzon Dax led a very long and full life , having lived past his 100th birthday ( ) . He had many romantic relationships , among those Tavana ' s mother ( ) and loved to play tongo . He was a top ambassador of the Federation in the late 2280s and the 2290s . In 2289 , he represented the Federation during negotiations at the Korvat colony ( early negotiations between the Klingon s and the Federation ) , and in 2293 , he represented the Federation at the Khitomer Conference . The Klingon representatives at the Korvat negotiations were Kang , Kor , and Koloth . Curzon walked out of the conference while Kang was speaking , but this opened the door for Curzon to form a close relationship with all three Klingon warriors . Curzon and Kang became such good friends , that when Kang ' s first child was born , Curzon was his godfather . The child was also named Dax in his honor . When the Albino killed the sons of all three Klingons , Curzon entered into a blood oath with them to avenge the deaths . ( ) Sometime in his life , Curzon , during his zhian ' tara got Tobin Dax drunk . ( ) Around 2339 , Curzon was involved in resolving the Klaestron Civil War . He became a friend of the Klaestron General Ardelon Tandro and had an affair with Ardelon ' s wife Enina . In 2369 , Curzon Dax was accused posthumously of treason and murder for the killing Ardelon Tandro . The Dax symbiont was placed on trial for the crime s . When Ardelon ' s widow came forward to admit the truth , Curzon was cleared , and Jadzia Dax was set free . ( ) Curzon met Benjamin Sisko in 2347 at Pelios Station when Sisko was an ensign . Curzon became a friend and mentor to him for nearly twenty years . Sisko affectionately dubbed him " old man " and continued to use the name for both Jadzia and later Ezri . The two later served on the USS " Livingston " together . ( ) Curzon had to deal with Sisko ' s temper at times . One time , Sisko was in an argument with an Argosian lieutenant , during which a drink was thrown in his face . Sisko intended to finish the fight , but Curzon held him back , eventually punching him in the jaw just to restrain him . He wore a ring which left a scar he held for many years later . ( ) In 2369 Jadzia told Kira Nerys how they were once cornered by a party of hostile Kalean s on Rochani III . Sisko told Julian Bashir about Curzon ' s perverse pleasure giving Sisko assignments like the service for VIP guests . Sisko " graduated " from these assignments after he hit one of the guests . ( ) Curzon was also known and feared for " breaking " Trill initiate s as a field docent for the Symbiosis Commission , and even eliminated Jadzia from the program . She later re - applied and succeeded in being approved for joining . She asked to be next in line for the Dax symbiont , and Curzon gave his consent . He later revealed to Jadzia during her zhian ' tara that he had actually been in love with her , and that this , not any fault of hers , was the reason he originally eliminated her from the program , unable to actually be with her as his role as her supervisor made such a relationship inappropriate , accepting her re - application partly out of guilt that he ' d nearly cheated her of something she ' d wanted all her life . ( ) According to Jadzia , Curzon was known to fall in love with someone new every week . Like most of the other hosts , however , he had no music al talent . ( ) Curzon once told Benjamin Sisko that the only persons who can handle Klingons are Klingons . In 2372 Sisko remembered this , and subsequently invited Worf aboard the station to investigate General Martok ' s task force . ( ) Curzon died of strain incurred while seeking " jamaharon " on Risa with Arandis in 2367 . His final days were spent in a hospital room yelling at the doctors and friends who were trying to keep him alive . He finally died as his family assembled at his bedside , as the symbiont was removed and implanted in a new host , becoming Jadzia Dax . ( ) During Jadzia ' s zhian ' tara , Odo claimed the personality and memories of Curzon . During this time , Odo ' s shapeshifting abilities caused him to even look like Curzon - indeed , the Guardian speculated that Odo ' s shapeshifting abilities essentially allowed him to ' join ' with Curzon much like a symbiont would with a host - and Curzon was able to reunite with Benjamin Sisko . At first , Curzon and Odo wished to remain as they were , robbing Jadzia of Curzon ' s memories . But after talking with Jadzia ( who needed a pep - talk first from Benjamin ) , Curzon admitted his love for Jadzia , acknowledged he was being selfish , and returned to Dax . Jadzia assured him that they would always be together through Dax . Curzon ' s restored memories also provided Jadzia with a first - hand idea of the joy and freedom Odo found in his shapeshifting abilities , while giving Odo a unique insight into life as a solid , prompting him to admit that food , drink and other physical pleasures were so compelling he was amazed that Curzon had ever managed to get any work done . ( ) Curzon enjoyed Juro Counterpunch and attending the Rujian Steeplechase . ( ) Appendices . Background information . Curzon was portrayed by Frank Owen Smith in and by Rene Auberjonois during Jadzia ' s zhian ' tara in . The latter performer thoroughly enjoyed the opportunity which portraying Curzon gave him to depart from his usual performances as Odo . Shortly after DS9 Season 4 began , Auberjonois speculated , " " I think Curzon may return at some point in the future . " " ( " , issue # 222 , pp . 29 & 30 ) Curzon was mentioned to be assigned to the Federation embassy on Romulus in a deleted scene from . According to the script for " Afterimage " , his name was pronounced as " KIHR - zahn " . " Apocrypha . Curzon has appeared in many novels , including " The Art of the Impossible " ( which showed him to have been a student of Sarek ) and " Forged in Fire " , which reveals the origin of his blood oath to slay the Albino , as well as a meeting with Hikaru Sulu during Sulu ' s first mission as captain of the . His mirror universe counterpart appeared in the novels " The Sorrows of Empire " and " Rise Like Lions " . The former depicts him as being appointed by Spock to be the Empire ' s Ambassador to the Klingon Empire until he is recalled and sent into hiding before the Alliance can conquer the Empire . The latter depicts him as still being alive in 2377 , by which time he is the last surviving joined Trill in the mirror universe , although he subsequently passes Dax on to Ezri Tigan . In the novel " Forged in Fire " , Curzon ' s pre - joining name is revealed to be Curzon Antrani .