Who married Douglas Sheffield, Baroness Sheffield?

Douglas, Lady Sheffield (née Howard; 1542/1543 – 1608), was an English noblewoman, the lover of Robert Dudley, 1st Earl of Leicester and mother by him of explorer-cartographer Sir Robert Dudley, an illegitimate son.

Seventeen years after Leicester's death she claimed in litigation that she had secretly been his wife, although she had herself remarried while Leicester was still alive.

John Sheffield, 2nd Baron Sheffield , of Butterwick (c. 1538 – 10 December 1568) was an English nobleman.