Mow'ga
Mow'ga was a Klingon chancellor who ruled during the Second Empire. 

During his reign, he ordered a fleet of Klingon warships to invade and conquer the Breen. The fleet was never heard from again. Worf mentioned this incident in 2375 as an example of the Breen's ferocity. ()

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Klingons
Klingon government officials