Saltair na Rann, or 'psalter of the verses', is considered one of the most important religious poems of early Ireland. There is only one early copy of the poem, held at Oxford Bodleian Library (MS Rawlinson B502: The Book of Glendalough) in a manuscript which was written c1130. The poem has been stylistically dated to the tenth century, the author is anonymous and it appears that the poem was not known outside of Ireland. The description of the cosmos in Canto I parallels that of Genesis 1, but also contains a collection of Irish and classical cosmological lore. The emphasis is on the measurements of this cosmos.
6th Australian Conference of Celtic Studies: Celts in legend and reality. Papers from the Sixth Australian Conference of Celtic Studies (Sydney July, 2007) p. 303-314