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He appears on March 11 in Mart. D with note from editor (Todd) "This saint is called Kessogus, Brev. Aberd. (11 March) fol. lxvi" Mart. O has "Senan Suthain" on March 22. Suthain is presumably same as Beithech.
Belongs to the group Senán, Mo Senóc, Senach, Senchán (ns)
Saint in place-names
Though no place-name referring to this particular saint has been identified, it may be that some of the places dedicated to the non-specific group to which he/she belongs may in fact refer to him/her. Please check the non-specific group.