Heaney in his poems reverses the concept of history. History is not a pattern preordained by prehistorical tribal myths and the legacies of enmity and strife which they authorize. He manifests that his historical consciousness is not the passive receptacle of the dreams and symbols associated with these. Pluralism is the very condition of post-modernity and post-colonialism which Ireland's history is brought about by the rational procedures of modernity. Heaney has the post-modernistic and post-colonial task of rewriting the old as a project of the new. By this time, we has construed traditional myth as a sacred and inviolable scripture. But post-modern myth which can only be reanimated and realized in a radically pluralist culture produces creative possibilities of rewriting the Irish community, culture, and history. Heaney's poems defend multi-culturalism. He integrates multiple cultural inheritance, cultural tradition ― Irish mythical inheritance, Anglicized Irish inheritance, tradition of Gaelic culture, tradition of Hellenistic culture, and cultural traditions; Englishism, Irishism, and Europeanism, and preforms the strategy of de-colonization which can substantialize Irish pluralistic culture. In “Digging” of Death of a Naturalist(1966) which constructs and deconstructs Irish tradition and identity, and in “Bogland” and “Shoreline” of Door into the Dark(1967), Heaney deals with an aggressive history of Ireland. He regards the memory of the landscape ― bog as the preservation of Irish tradition and history, and on the other hand, discloses Irish identity through revisioning and dismantling of the vestiges of English imperialism. Heaney, in “Anahorish” and “Broagh” of Wintering Out(1972) illuminates the historical process of language for recovering identity and national consciousness of the lost Ireland. And he tries to explore and resolve his own as well as Irish quest for identity through Irish political history, cultural tradition, and the study of the language. In “A New Song” and “Tradition”, the poet asserts the de-colonizing of the language and the writing of ‘english’ for defending the peculiarity of Irish culture. Anglicized Irish history through the myth of Goliath and David, and Hercules and Antaeus, in “Bone Dreams” and “Hercules and Antaeus” of North(1975) is investigated. The poet shows the strategy of de-colonization for subverting the entire system of imperial cultural assumptions in these myths. In “From the Parable Island” and “From the Frontier of Writing” of The Haw Lantern(1987), Heaney demonstrates the cross-cultural de-colonization through and abrogation of the imperial central language, thought, and assumption. Post-colonialism of Heaney's poems make an alternative plan which can penetrate into the race problem, the regional emotion, the sex problem, the disparity in wealth, and the struggle for power. This shows us universality of the real world.