William Ætheling (5 August 1103 – 25 November 1120), designated or titled
Adelin (alternately rendered as
Adelinus,
Adelingus,
A(u)delin or other Latinized Norman-French variants of
Ætheling), was the son of
Henry I of England by his wife
Matilda of Scotland, and was thus heir apparent to the throne. His early death without issue caused a succession crisis, known in history as
The Anarchy.