Sarah Churchill, Duchess of Marlborough John chose Sarah over Catherine Sedley, but both John's and Sarah's families disapproved of the match, therefore they married secretly in the winter of 1677–78. John and Sarah were both Protestants in a predominantly Catholic court, a circumstance that would influence their political allegiances. Although no date was recorded, the marriage was announced only to the Duchess of York, and a small circle of friends, so that Sarah could keep her court position as Maid of Honour. When Sarah became pregnant, her marriage was announced publicly (on 1 October 1678), and she retired from the court to give birth to
Sarah Churchill, Duchess of Marlborough 20 February 1703. Sarah was heartbroken over the loss of her son and became reclusive for a period, expressing her grief by closing herself off from Anne and either not answering her letters or doing so in a cold and formal manner. However, Sarah did not allow Anne to shut her out when Anne suffered bereavement. After the death of Anne's husband, Prince George of Denmark in 1708, Sarah arrived, uninvited, at Kensington Palace to find Anne with the prince's body. She pressed the heartbroken queen to move from Kensington to St James's Palace in London, which Anne bluntly refused,