Eochaid mac Colla (c. 560 – 640), better known as Saint Dallán or Dallán Forgaill (Old Irish: Dallán Forchella; Latin: Dallanus Forcellius; Primitive Irish: Dallagnas Worgēllas), was an early Christian Irish poet and saint known as the writer of the "Amra Coluim Chille" ("Elegy of Saint Columba") and, traditionally, "Rop Tú Mo Baile"[1] ("Be Thou My Vision").

[2] His nickname, Dallán ("little blind one"), was earned after he lost his sight,[3] reputedly as a result of studying intensively.

He was born in Maigen (now Ballyconnell), at the eastern edge of the territory of the Masraige of Magh Slécht in the north-west of modern County Cavan.

[12] In a list of ancient Irish authors contained in the Book of Ballymote, Dallán is called "grandson of testimony".

[13] Saint Dallan was a poet, Chief Ollam of Ireland, as well as a scholar of Latin scriptural learning.

Conn cet cathach a righi (This is the final poem in the tale "Aírne Fíngein")[19] 5.