This chapter examines the latticework of links between Shakespeare and Spenser, telling a tale of two writers. One goes to London to become poet and playwright, the other to Dublin with dreams of a dramatic career, where he finds his theatre of worldlings is a theatre of war. If Spenser’s influence on Shakespeare, especially early Shakespeare, is seldom discussed, Shakespeare’s influence on Spenser remains an even more neglected topic. Spenser is crucial here, since that poet’s Irish residence necessitates a broadening of horizons, and he is viewed as part of a recognizable circle. Shakespeare, a lifelong co-author and collaborator influenced by several of Spenser’s Irish contemporaries, is too often viewed in isolation. From the Spenser–Harvey correspondence and the early histories onwards, this study tracks the collaborative underpinnings of both writers’ work, charting their influences from a shared reliance on Holinshed to a common concern with innovation in form and genre.