The "Cloak of Senan" must have been an actual relic preserved on Inis
Cathaig; tradition said that it had been floated on the river to the
saint of the island, though there were various opinions as to which
saint had done the miracle; it is attributed to Brigit daughter of Cu
Cathrach (LL, 2399) and to Diarmait (CS, 753). For parallels to the
automatic transfer of objects by water, see Plummer, VSH, i, p.
clxxxvi, note 2.