He lived during the time of the Earth-Romulan War when the conflict ended inconclusively after staggering losses were faced by both sides. At the time, Dannon was the senior councilman who convinced his colleagues to make a peace offer to the Romulan Star Empire on reference stardate 1/0909. The measure was ultimately accepted by a 1-vote margin. This led to a peace settlement made over subspace radio between them and their Romulan counterparts though no face-to-face meeting was made which left the appearance of the Romulans a mystery to Dannon.
After the establishment of the Romulan Neutral Zone by the treaty on Stardate 1/0909.10, Dannon's political aspirations were destroyed by the negotiations when his opponents claim that as chief negotiator he had given away too much of the disputed area to the Romulans. By Stardate 1/1303.21 at the age of 59, Dannon was assassinated by a spectator at a political party where he was scheduled to speak. Though he was considered a controversial and even despised figure in his own time, his contributions led him to be revered for his actions in the pursuit of peace.
- In the FASA RPG continuity, the Romulan War was between the UFP and the Romulans. Though it's not stated, it's presumed that Dannon was a Human. In the light of the canonical version, it is likely that, since the Federation did not exist at the time of the Earth-Romulan War, that Dannon either represented Earth in the Coalition of Planets or possibly the Earth Alliance or perhaps the United Earth government.