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Offa has his son consecrated as King; the first such ceremony in England.
788
23 September — Ælfwald I of Northumbria is murdered, probably at Chesters, by ealdormanSicga and succeeded by his first cousin Osred II as king of Northumbria.
At Offa's urging, the Pope elevates the Bishopric of Lichfield to an Archbishopric.
789
Charlemagne establishes a trade embargo on the English after failed negotiations for his daughter to marry Offa's son.
Norse activity in the British Isles: Viking raid on England, at Portland.
790
Æthelred is restored as king of Northumbria following the deposition of Osred II and institutes minting of the styca to replace the silver sceat.
792
12 August — Death of Jænberht, Archbishop of Canterbury. He is succeeded by Æthelhard.
October — Osred, the deposed king of Northumbria, returns from exile and is murdered.
20 May — King Æthelberht II of East Anglia is beheaded on the order of King Offa of Mercia at Sutton Walls, Herefordshire.
796
18 April — Æthelred I of Northumbria is murdered at Corbridge by a group led by ealdormen Ealdred and Wada. Osbald succeeds him as king of Northumbria for 27 days before going into exile, initially in Lindisfarne.
14 May — Eardwulf succeeds as king of Northumbria.
29 July — Offa of Mercia dies having raided Dyfed and possibly fought in the Battle of Rhuddlan Marsh (perhaps against Caradog ap Meirion). He is buried, maybe at Bedford, and succeeded by his son Ecgfrith who reigns only until December; Wessex regains its independence.