Siân Phillips
From Tardis Wiki, the free Doctor Who reference
Dame Siân Phillips (born 14 May 1933[1]) voiced an older Zara in the Graceless IV story The Bomb. She later played bounty hunter COLT-5000 in the Jenny: The Doctor's Daughter stories Neon Reign and Zero Space, and Pilgrim in the Ravenous audio stories Better Watch Out and Fairytale of Salzburg. She was once married to Robin Sachs.
She is best known for playing Livia in I, Claudius.
