List of Famous people named Aethelred

Æthelred, known as the Unready, was King of the English from 978 to 1013 and again from 1014 until his death. His epithet does not derive from the modern word "unready", but rather from the Old English unræd meaning "poorly advised"; it is a pun on his name, which means "well advised".

Æthelred was king of Mercia from 675 until 704. He was the son of Penda of Mercia and came to the throne in 675, when his brother, Wulfhere of Mercia, died. Within a year of his accession he invaded Kent, where his armies destroyed the city of Rochester. In 679 he defeated his brother-in-law, Ecgfrith of Northumbria, at the Battle of the Trent: the battle was a major setback for the Northumbrians, and effectively ended their military involvement in English affairs south of the Humber. It also permanently returned the kingdom of Lindsey to Mercia's possession. However, Æthelred was unable to re-establish his predecessors' domination of southern Britain.

Æthelred, Lord of the Mercians became ruler of English Mercia shortly after the death of its last king, Ceolwulf II in 879. His rule was confined to the western half, as eastern Mercia was then part of the Viking-ruled Danelaw. Æthelred's ancestry is unknown. He was probably the leader of an unsuccessful Mercian invasion of Wales in 881, and soon afterwards he acknowledged the lordship of King Alfred the Great of Wessex. The alliance was cemented by the marriage of Æthelred to Alfred's daughter Æthelflæd.

Æthelred, was the king of Northumbria from 774 to 779 and again from 790 until he was murdered in 796. He was the son of Æthelwald Moll and Æthelthryth and possibly became king while still a child after Alhred was deposed.

Æthelred was king of Northumbria in the middle of the ninth century, but his dates are uncertain. N. J. Higham gives 840 to 848, when he was killed, with an interruption in 844 when Rædwulf usurped the throne, but was killed the same year fighting against the Vikings. Barbara Yorke agrees, and adds that Æthelred was the son of his predecessor, Eanred, but dates his death 848 or 849. D. P. Kirby thinks that an accession date of 844 is more likely, but notes that a coin of Eanred dated stylistically no earlier than 850 may require a more radical revision of dates. David Rollason accepts the coin evidence, and dates Æthelred's reign from c.854 to c. 862, with Rædwulf's usurpation in 858.