The tenuous peace was shattered, war was declared, and two massive alliances tore the galaxy in half.
Then, suddenly, the game triggered a random event that caused my ambassador to try to kill a rival leader. The galaxy had been at peace for a while, if tenuously, with me as one of the surviving seven or so empires. It happened late in an epic campaign, in which the entire galaxy had been colonized and everyone was cozy in an alliance. My favorite memory from a grand strategy game comes from the original Master of Orion.