Sarah Whiteside

Lady Sarah Whiteside was a lady-in-waiting to Queen Mary I of England and one of Evelyn Smythe's ancestors. She was secretly married to Reverend Thomas Smith, which was forbidden under the Queen's rule. Sarah was ordered to be executed until the Sixth Doctor (under his "John Smith" alias) revealed that she was pregnant with Thomas's child. Upon hearing this (and with the Doctor's persuasion), the Queen ordered her to act as lady-in-waiting to Elizabeth I (who was under house arrest). Grateful that he helped spare her life, Sarah swore to name her unborn child (John Whiteside-Smith) after the Doctor. (BFA: The Marian Conspiracy)