Sue, Sorry, missed your post.
No more details at present - Hy Brasil is the 'fourth' Aran Island.
Jim

Hy Brasil, the Isle of the Blessed, is possibly a legacy from ancient paganism, which placed its Tirnan-oge, The Land of Youth, in the waves 'on the west side down from Aran, where goes the sun to its couch.' The desire for the ageless, deathless land prevailed all up the western coast, and was strong in Kilkee in 1868-78, and perhaps even still. I myself saw the mirage several times in 1872 giving the prefect image of a shadowy island with wooded hills and tall towers springing into sight for a moment as the sun sank below the horizon. I have also heard from Kilkee fishermen legends, like that embodied in the verses of Gerald Griffin, of men starting seaward to reach its fairy shores, and never returning.

Another magic island was Kilstuitheen, or Kilstuiffen, in Liscannor Bay. On the southern shore, in 1839, there was said to have been an ecclesiastical city swallowed up by the earthquake that split Innis Fitae into the present three islands, which suggests derivation from O'Conor's then recent version of the various Irish Annals. On the northern shore the tradition was fuller. Kilstuitheen sank when its chieftain lost its golden key in battle, nor will it be restored until the key is recovered from its hiding place, under the ogham-inscribed gravestone of 'Conan' on Mount Callan. (When that place was dug out only bones and rusted iron were found.) The island, with its golden-roofed palaces, churches, and towers, may at times be seen shining far below the waves, but once in seven years it rises above them, and those who see it then are said to die before its next appearance. The fishermen

    'point how high the billows roll above lost Kilsafeen,
    Its palaces and towers of pride
    All buried in the rushing tide
    And deep-sea waters green.'