What room was Winston Churchill born in?

Got me stumpped. I can tell you what building, though. He was born on November 30, 1874, at Blenheim Palace, the famous palace near Oxford built for John Churchill, 1st duke of Marlborough. Most likely in the master bedroom.

It was actually in a small bedroom just off the Great Hall in Blenheim Palace, 2 weeks prematurely. It was the former bedroom of Dean Jones, the 1st Duke's chaplain. I know because I visited it today!