Fifth century Athenians were expecially hostile to tyrants and tyranny as a result of Peisistratid treachery during the Persian Wars. Their hostility engendered a persistent refusal to acknowledge the truth of collaboration during the tyranny and so a revisionism which fundamentally affected the tradition about it. This study first examines the psychology of mass revisionism and of the early fifth century Athenians leading to their transfigurement of the tyrannicide/s; genos- and demos-traditions and topoi relating to the tyranny affirm and further define the distortion and deformative process affecting the historical record. This work aims to establish better bases for reconstructing Peisistratid history, but also for comprehending the psychology of Athenian antityrannism.