 All annals include material derived from other sources, or added at a later date.None are complete, although the "Annals of Ulster" and the "Annals of Inisfallen" cover Cerball's lifetime.The "Annals of Clonmacnoise" survive only in an eccentric 17th-century English translation, and the "Annals of Tigernach" for this period are lost, although Dubhaltach Mac Fhirbhisigh's abbreviated copy known as the "Chronicon Scotorum" supplies much of the missing material.