Quattuor Anni (Latin for "Four Years") was a political movement within the United Federation of Planets that advocated a renewal of overt hostilities against the Klingon Empire. Among its numbers were Starfleet veterans (and families of casualties) of the Four Years War. (More Missions, More Myths 18: "Fatal Vision")
Margaret Fitzgerald, commanding officer of the USS Shaitan and daughter of Admiral Fitzgerald, was a member of Quattuor Anni.