K'Trelan
K'Trelan was a Klingon general who served under Emperor  during the Second Dynasty. 

K'Trelan assassinated Reclaw and brought the Second Dynasty to an end, installing in its place a democratically elected government. This period would later be referred to by Klingon historians as "The Dark Time". 

In 2374, while Jadzia Dax was reciting the chronicle of the women in Sirella's family in the days leading up to the Trill's upcoming wedding to Worf, she commented on the historical significance of K'Trelan's democratic movement, something Sirella felt was irrelevant.
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de:K'Trelan

Klingon military personnel
Klingons