ca. 1468 Eleonore Portugal by Hans Burgkmair (Kunsthistorisches Museum Vienna)
She lived from 1436 - 1467, and was wife of Holy Roman Emperor Friedrich III. This is a posthumous portrait.
This may be from the old Worldroots site, now the Artroots site's "History of Portugal" album. The Artroots site portions related to this site is here.

