Philologische Untersuchungen aus dem Mittelalter, Ludwig Traube, pp.399-395, Abhandlungen der königlichen bayerische Akademie der Wissenschaften, Klasse 19, 1894.
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Ludwig Traube believed him to be identical with the Abbot Cellanus who's obit is recorded in the Annales Laureshamenses under 706; and was probably the Cellan mac Sechnusaigh, sapiens, recorded in the same year in the Annals of Ulster (pp.96-119, 1900).