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Memory Beta, non-canon Star Trek Wiki

The Tanwa-Seynorral of the Caeliar was the Caeliar equivalent to a head of government. The phrase was an idiom that translated to "first among equals" (a phrase similarly used to refer to Earth prime ministers in the pre-Unification era). The tanwa-seynorral often served as a representative of and leading figure in the Caeliar Quorum. (ST - Destiny novel: Gods of Night)

In 2168, the Caeliar Tanwa-Seynorral was Ordemo Nordal. His term of office extended through the temporal displacement of Axion to 1519 and lasted at least until 2381. (ST - Destiny novels: Mere Mortals, Lost Souls)

Heads of Government
Interstellar States Federation PresidentKlingon ChancellorRomulan PraetorImperial Romulan State EmpressRomulan EmpressRomulan Republic ProconsulCardassian CastellanCardassian Chief ExecutorFerengi Grand NagusTzenkethi AutarchGorn ImperatorGorn KingBreen DomoOrion ChancellorTholian Ruling ConclaveThallonian Prime MinisterTezwan Prime MinisterEnoch PresidentKropasar High CyningCaeliar Tanwa-SeynorralTalarian Commander-in-ChiefKinshaya Pontifex
Federation Member States United Earth Prime MinisterVulcan AdministratorVulcan First MinisterAndorian PresiderAlpha Centauri GovernorBajoran First MinisterTrill PresidentCestus GovernorBetazoid GovernorDenevan PresidentPacifican GovernorPeliar Zel GovernorZaldan LeaderZeta-Atezian Imperator
Federation Colonies Tarsus GovernorAlpha V GovernorMantilles GovernorCaldos Governor
UFP Member State Polities United States President (United Earth)Indian Prime Minister (United Earth)Governor of Prophet's Landing (Republic of Bajor)
Mirror Universe Terran EmperorTerran ConsulKlingon RegentGorn ImperatorChairman of the Galactic CommonwealthPraetor of the Romulan Star Empire