jats:titleAbstract</jats:title> jats:pThis article investigates the naval strategies of England’s post-Conquest kings, especially from c.1100–1189, a period for which modern scholarship has yet to recognise the existence of a royal navy. It demonstrates that post-Conquest kings deployed warships, summoned defensive fleets, and launched their own invasion navies throughout the long twelfth century. Previously unnoticed evidence for the maintenance of warships under Henry II is discussed and records of fleet recruitment are used to shed light on the systems behind naval levies. Given all this evidence, it can firmly be concluded that there was a navy at the disposal of England’s Anglo-Norman and Angevin kings. The origins of this navy are twofold. Firstly, twelfth-century tactics drew on Anglo-Saxon and Anglo-Danish systems and precedents, suggesting the long continuity of post-Conquest naval activities rather than sudden naval innovation under any particular king. The ‘English navy’ therefore did not decline after the Norman Conquest, nor was it a new foundation of Richard I. Secondly, England’s twelfth-century rulers relied upon the maritime skills and co-operation of coastal and port inhabitants across the realm. These coastal denizens’ motivations for participation in royal navies reveal both the extent and the limitations of English royal power. Royal naval activities took place against the backdrop of a European north that was becoming ever more connected by sea routes. English navies were therefore a crucial component of territorial expansion and warfare across a realm situated in the midst of extensive pan-European trading networks.</jats:p>