Gowron

2367: Became Chancellor after K'mpec died
2367-2368: Challenged by the Duras sisters, which caused a civil War, won the war
2372: Invade the Cardassian Union, withdrew from the Khitomer Accords
2373: Reinstated the Khitomer Accords due to the Dominion threat
2375: Felt threatened by Martok’s political influence, kept sending him on hopeless missions
Risked the alliance’s victory in the Dominion War, challenged to a duel by Worf & was killed