Æthelstan Ætheling, son of Æthelred the Unready

Æthelstan Ætheling was the eldest son of King Æthelred the Unready by his first wife Ælfgifu, and was the heir apparent to the kingdom until his death. He is first mentioned as a witness to a charter of his father in 993. He probably spent part of his childhood at Æthelingadene, Dean in west Sussex, and his paternal grandmother Ælfthryth may have played an important part in his upbringing. Almost nothing is known of his life, although he seems to have formed a friendship with Sigeforth and Morcar, two of the leading thegns of the Five Boroughs of the East Midlands.

Æthelred II, known as Æthelred the Unready, was King of the English from 978 to 1013 and again from 1014 until his death in 1016. His epithet comes from the Old English word unræd meaning "poorly advised"; it is a pun on his name, which means "well advised".