This chapter considers custom’s function in colonial conquest, juxtaposing England’s conquest-filled history, which emerges in Edmund Spenser and Gabriel Harvey’s debate about the imposition of classical meter, or quantitative verse, on English verse, with English attempts at expansion in Ireland, the subject of Spenser’s A View. I argue that their debate reveals the method by which the foreign becomes native via custom, a process that Spenser draws upon in order to justify his violent approach to conquering Ireland and imposing common law. At the same time, however, by exploring the history of Ireland’s equally customary Brehon law, Spenser reveals the difficulty of establishing linguistic—and therefore political—chronologies within a global history that stretches beyond the vexed borders of Ireland and England.