15 April 2025. Accounts of the Ocean in premodern periods are often analysed against the background of what was not yet known at the time: studies abound in premodern seafarings, premodern zoologies, premodern geographies, premodern cosmographies. We often investigate the early medieval worldview in terms of what we now know that they did not. However, any study of the Ocean in the modern milieu immediately reveals that our current relationship with the Ocean goes far beyond what we know and do not know about it. This paper will attempt to review a few accounts of the Ocean from early medieval Ireland from this emerging perspective, in order to see whether we might find more in common with them than the often-discussed knowledge gap suggests.