Gilla Mo Dutu Úa Caiside (fl. 1147) was a GaelicIrish poet.

Closely associated withTighearnán Ua Ruairc, King ofBréifne, he was attached to the monastery ofDaminis and possibly to the church ofArd Brecáin, being a cleric.

His two famous compositions areÉri óg inis na náem and theBanshenchas.

TheÓ Caiside family later became – from the 14th century – prominent inFermanagh, and many of them became hereditary doctors to the Maguire chieftains.

His known compositions are:

• Éri óg inis na náem
• TheBanshenchas (Ádam óenathair na ndóene)
• Eight poems in the lives of St. Mo Laisse and M'Áedóc
  • Ca lion mionn ag Maodhócc
  • Cert Maodhócc ar shluagh Mhancach
  • Comhroinn Maodhócc, fa mór modh
  • Eittirbretha Maodhócc min
  • Uasal an mac, mac Setna
  • Cia is fearr cairt ar dháil mláisi
  • Cia thairngir mlaisi ria theacht
  • Molaisi eolach na heagna
• Cuibdea comanmann na rig
• Sé rígh déag Eoghain anall

• The Prose Banshenchas, unpublished Ph.D. Dissertation, UCG, 1980.
• The Manuscript Tradition of the Banshenchas,Éiru 33 (1982) 109-35
• An Bansheanchas,Léachtaí Cholm Cille xii: Na mná sa litríocht, eag. P. Ó Fiannachta (Maigh Nuad, 1982), 5-29.
• Gilla Mo Dutu Úa Caiside, by Kevin Murray, inCín Chille Cúile, ed. J. Carey, M. Herbert and K. Murray (Aberystwyth: Celtic Studies Publications, 2004), 150–162.

• 12th-century Irish poets
• Writers from County Meath
• People from County Fermanagh
• 12th-century Irish historians
• Irish religious writers
• Medieval European scribes
• Irish scribes
• Irish male poets
• Medieval Gaels from Ireland
• Irish-language writers

• Articles with short description
• Short description matches Wikidata
• Use dmy dates from March 2020
• Use Hiberno-English from March 2020
• All Wikipedia articles written in Hiberno-English