"Ag CrÃÂost an SÃÂol" (; meaning "Christ's is the seed") is an Irish poem, later set to music by Seán àRiada and subsequently widely used as a hymn.
There are conflicting accounts of the origins of Ag CrÃÂost an SÃÂol.
Some sources describe the poem as "traditional" or "an old anonymous prayer".
Another source says that it was in fact written in 1916 by Father Michael Sheehan (Micheál àSÃÂocháin) of Waterford, a co-founder of Coláiste na Rinne, the Irish College in An Rinn, County Waterford, who later became assistant Archbishop of Sydney, Australia.
A third source, published within the lifetime of Fr. Sheehan, credits the words to the similarly named Fr. Michael Meehan (Micheál àMÃÂocháin) (1810-1878), long time Parish Priest of the parishes of Moyarta and Kilballyowen in County Clare.
The words were set to music by Seán àRiada as the offertory hymn in his 1968 setting of the mass, Ceol an Aifrinn (literally, "Music of the Mass"; known in English as the "àRiada Mass"), which is used to close a number of Irish traditional music gatherings, such as summer schools.