Deusdedit died at some time around the Synod of Whitby, although the exact date is disputed. Bede, in the "Historia ecclesiastica gentis Anglorum", states that "On the fourteenth of July in the above mentioned year, when an eclipse was quickly followed by plague and during which Bishop Colman was refuted by the unanimous decision of the Catholics and returned to his own country, Deusdedit the sixth Archbishop of Canterbury died." A solar eclipse occurred on 1 May 664, which would appear to make the date of Deusdedit's death 14 July 664. But that conflicts with Bede's own information earlier in the "Historia", where he claims that Deusdedit's predecessor, Honorius, "died on the 30th of September 653, and after a vacancy of 18 months, Deusdedit, a West Saxon was elected to the archiepiscopal see and became the 6th Archbishop. He was consecrated by Ithamar, Bishop of Rochester, on the 26th of May, and ruled the see until his death nine years, four months, and two days later." If this information is accurate, then Deusdedit must have died on 28 July 664. Various methods of reconciling these discrepancies have been proposed. Frank Stenton argues that Bede began his years on 1 September; thus the date of Honorius' death should be considered 30 September 652 in modern reckoning. Further, Stenton argued that medieval copyists had introduced an error into the manuscripts of the "Historia", and that Bede meant that the length of Deusdedit's reign was 9 years and 7 months, rather than 9 years and 4 months as stated in the manuscripts. From this, he concludes that Deusdedit's death occurred in the year September 663 to September 664. This would make the year of death correct according to the eclipse, but still leave a discrepancy on the specific day of death, for which Stenton asserted the length calculations given by Bede were more correct than the actual death date given. Thus Stenton concluded that Deusdedit died on 28 October 663.