Anglo-Saxon Chronicle. 776. This year died Bishop Petwin, on the thirteenth day before the calends of October, having been bishop fourteen winters. The same year Ethelbert was consecrated Bishop of Whitern, at York, on the seventeenth day before the calends of July.
On 14 Jun 776 Bishop Ethelbert of Whithern was consecrated Bishop of Whithorn aka Galloway.
Anglo-Saxon Chronicle. 780. This year a battle was fought between the Old-Saxons and the Franks; and the high-sheriffs of Northumbria committed to the flames Alderman Bern at Silton, on the ninth day before the calends of January. The same year Archbishop Ethelbert died at York, and Eanbald was consecrated in his stead; Bishop Cynewulf retired to Holy-island; Elmund, Bishop of Hexham, died on the seventh day before the ides of September, and Tilbert was consecrated in his stead, on the sixth day before the nones of October; Hibbald was consecrated Bishop of Holy-island at Sockbury; and King Elwald sent to Rome for a pall in behoof of Archbishop Eanbald.
In 780 Bishop Ethelbert of Whithern died.