Gaunilo assumes that there is no greatest conceivable island, and most philosophers have followed him in this assumption. But the option was open for Anselm (and remains open for us) to bite the bullet and ‘give him his island.’ I argue that such a response is perfectly reasonable for a Platonist like Anselm, and that even a theist who isn’t a Platonist can tolerate the island as a fairly minor addition his or her ontology.

Various attempts have been made to save Gaunilo's ‘ideal’ island by proposing different criteria for its maximal greatness or perfection. This paper addresses a recent proposal that ‘an ideal island is conceivable if it's defined as any island exhibiting an ideal ratio of great‐making island properties’ (Milo Crimi, ‘Ideally sized islands: Reply to Danielyan, Garrett and Plantinga’, Analysis 77 (2), 273‐278) and shows that it fails because the idea of an island – indeed, of anything that is finite, delineated and (...) circumscribed as a necessary condition of its conception ‐ cannot accommodate maximal greatness or perfection; neither can a determined quantitative relation between finite relata constitute a criterion of maximal greatness or perfection. Danielyan, Edgar (2018), On the Inherent Incoherence of Gaunilo's Island. The Heythrop Journal. doi:10.1111/heyj.13056. (shrink)