In 1542, the Irish Parliament passed the Crown of Ireland Act, which proclaimed Henry VIII of England as King of Ireland, elevating the island from a lordship to a kingdom. This act was part of the Tudor policy to centralize royal authority and bring the entire island under English control. The new kingdom, however, was not recognized by Catholic Europe, deepening Ireland's religious and political isolation.

The establishment of the Kingdom of Ireland provided a new constitutional framework that influenced the political poetry of the era, as bards and chroniclers adapted to the changing political landscape. The act's association with the English crown became a focal point for later nationalist poets who rejected the legitimacy of English rule. It set the stage for centuries of poetic debate over Ireland's true sovereign identity.