Legend of Lady Bruna(2009)
(A book in the Darkover Short Stories series)
A Novella by Marion Zimmer Bradley
All with the right to rule the Alton Domain were dead, save Kennard's unborn son. Lady Bruna swore to serve as Regent, to protect her brother's widow and child, and command the Guards in Thendara until the boy was old enough to take up the duties himself.
Used availability for Marion Zimmer Bradley's Legend of Lady Bruna
December 2009 : USA, Canada, UK Kindle edition