 As Chapter 66 of his On the Reckoning of Time , in 725 Bede wrote the Greater Chronicle ( <unk> <unk> ) , which sometimes circulated as a separate work . For recent events the Chronicle , like his Ecclesiastical History , relied upon Gildas , upon a version of the Liber <unk> current at least to the papacy of Pope Sergius I ( 687 – 701 ) , and other sources . For earlier events he drew on Eusebius 's <unk> <unk> . The dating of events in the Chronicle is inconsistent with his other works , using the era of creation , the anno mundi . 
