The Murders in Dublin Phoenix Park in May 6, 1882 is one of several historical events which was treated in Ulysses and Finnegans Wake. The assassination of high officials was motivated by the Irish radical nationalist group, the Invincibles, in order to get the Irish freedom from the British imperial power. Joyce reconstructed this historical event through "retrospective arrangement" in his texts, but with some intentional errors and sometimes in the extreme exaggerations. This study is mainly focused on how this national history was textualized: the processes of intentional errors, of the complex palimpsest, and of the melodramatic romance. Joyce delighted in having his characters of Ulysses display their imperfect historical memories so that the readers fall into confusion and doubt about which are factual and fictional. The writer even intertwined this historical event with the other ones in its representation, to make the text a kind of palimpsest writing. By this narrative method of palimpsest writing, all of the courageous sacrifice of the revolutionary heroes are parodied in the melodramatic situation. Joyce attempted to expose and subvert Irish popular culture`s received notion of the national heroic martyrdom. It is the way for him to rebel the immutability of history, and to open the infinite possibility of national history.