The Blessed Isles are mentioned several times in Thus Spoke Zarathustra, and are referred to as the dwelling of Zarathustra’s future progeny and a place of hope. Zarathustra journeys to the island in part 2, and the speeches of part 2 are delivered here.

The name is a reference to the Fortunate Isles, a group of islands representing, as described by the Greek poet Hesiod, a mythical and idyllic location abundant in resources, inhabited by heroes and ruled by Cronus, the god of time. Other writers who referred the Fortunate Isles include the poet Horace, Pindar, Lucian of Samosata, Pliny the Elder, Homer and Virgil.