Gorkan

He was a Chancellor of The Klingon High Council. He pursued peaceful relations between The Klingons and The Federation. He was murdered prior to the Kiomor Conferance. An explanation of his murder, which was provided, allowed for successful negotiations,  which broght peace the two peoples.

Klingon Civil War

This conflict was about picking a leader of the Klingon High Command. The comflict ensued between Gowron and the House of Duras. Victoriously Gowron won and led the Klingons.

Damar

A military leader in the Cardassian army. He served under Gul Dukot and succeeded him as a leader.

Kurn

He is Worf's younger brother. His memory was erased to regain his honor after his involvement in betraying the Klingons to the Romulans. He was placed in the Lorgh family when Worf and his parents moved to Kitomer. When his family was presumed dead, the Lorgh family adopted him.

Klaa

He was a captain of a Bird of Prey. He was tired of disinigrating space junk. He wanted something that would fire back.

A Klingon, General Kord, got taken hostage with Humans and Romulans. He encouraged the Federation to take action.

K'Vagn

He was a Klingon general who served in the defense forces. He was the cheif who saw over the making of Human-Klingon hybrids. However during the trail they made a non-lethal virus. Phlox was kidnapped to help find a cure.

The Imperial Family

This family was in the direct line of Kahles. They were all put to death at the end of the second destiny of the Klingon Empire.