Imram (The Death of Saint Brendan) is a poem written by J.R.R. Tolkien and published in Time and Tide in December 1955.
The title is Irish for "voyage"; Imrama were Celtic tales about Irish explorers who sought the Land of Promise in the Atlantic.
A version of the poem appeared as part of "The Notion Club Papers" within Sauron Defeated; the original version was also provided among the commentaries.
 See also
J.R.R. Tolkien, Christopher Tolkien (ed.), Sauron Defeated, "Part Two: The Notion Club Papers Part Two: Note on 'The Death of Saint Brendan' with the text of the published form 'Imram'"