The Collaborative International Dictionary of English v.0.48:

Angles \An"gles\, n. pl. [L. Angli. See Anglican.] (Ethnol.)
   An ancient Low German tribe, that settled in Britain, which
   came to be called Engla-land (Angleland or England). The
   Angles probably came from the district of Angeln (now within
   the limits of Schleswig), and the country now Lower Hanover,
   etc.
   [1913 Webster]