Immram Curaig (Maíl(e )Duin)/Maíldúin, or Immram(m) Curaig Mælduin Inso, or Immram Mæle Dúin (The Voyage of Mæl Duin’s Boat), or (Voyage of Máel Dúin), mainly from Lebor na hUidre and the Yellow Book of Lecan. Eleventh Century AD (as early as Eighth Century AD).

Immram Curaig (Maíl(e )Duin)/Maíldúin, or Immram(m) Curaig Mælduin Inso, or Immram Mæle Dúin (The Voyage of Mæl Duin’s Boat), or (Voyage of Máel Dúin), mainly from Lebor na hUidre and Yellow Book of Lecan. Eleventh Century AD (as early as Eighth Century AD):

van Hamel, Anton Gerard. ‘The Text of Immram Curaig Maíldúin’ in Etudes Celtiques, Volume 3, Issue 5 (1938), pp1-20.
https://www.persee.fr/doc/ecelt_0373-1928_1938_num_3_5_1150

Whitley Stokes, tr. ‘The Voyage of Mael Duin’s Boat (Immram curaig Maíle Duin LU, YBL, Harl. 5280, Eg. 1782)’ at Editions de l’Avenance.
https://sejh.pagesperso-orange.fr/keltia/immrama/maeldun_en.html