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USS Morrigan was an Akyazi-class perimeter action ship on active duty in Starfleet during the very late 23rd and early 24th centuries.

USS Morrigan, USS Ogma and USS Balor were commissioned as a group and assigned to Task Force Accord in 2298. (Star Trek: Accord: Timeline)

Akyazi-class starships
USS Archer - SS Ariadne - USS Atropos - USS Balor - USS Blue Nose - USS Clotho - USS Darwin - USS Lachesis - USS Morrigan - USS Ogma
Ships of the Star Fleet: USS Abila - USS Accra - USS Abreus - USS Acavus - USS Accipiter - USS Acri - USS Akita - USS Akitsu - USS Akyazi - USS Alten - USS Amagi - USS Amastra - USS Ameer - USS Ancylus - USS Arauca - USS Araxes - USS Astura - USS Atuga - USS Avesta - USS Bendraze - USS Bengal - USS Beuel - USS Biisk - USS Bisbee - USS Braga - USS Brant - USS Bril - USS Bucke - USS Buran - USS Ebro - USS Echo - USS Eiger - USS Eire - USS Eleusis - USS Ephesus - USS Epirus - USS Ermont - USS Evian
Arbiter subclass: USS Acerra - USS Agtekerk - USS Almdes - USS Apia - USS Apure - USS Arashi - USS Arban - USS Arbiter - USS Archer - USS Argus - USS Armavir - USS Artika - USS Atago - USS Atessa - USS Aulon - USS Aversa - USS Azusa - USS Jari - USS Jelai - USS Jico - USS Juist - USS Julin - USS Tachira - USS Talence - USS Tensas - USS Thrace - USS Thun - USS Tioga
Akula subclass: USS Ajanta - USS Akula - USS Akuri - USS Anaiza - USS Athy - USS Kalinin - USS Kelkit - USS Kern - USS Kitkun - USS Krka - USS Kuril - USS Sandusky - USS Sangamon - USS Saros - USS Shirante - USS Sjoto - USS Sybaris