Analysis of information sources in references of the Wikipedia article "Sigeberht of East Anglia" in English language version.
Saint Sigebert: Died 635; feast day 16 January, sometimes 27 September
St. Sigebert, king of the East Angles, martyr (635) (Celtic & British), January 16.
It was he who converted Sigebert (September 27), King of East Anglia ...
Sigebert Jan 25