Who is Clementine Churchill from Winston Churchill: A Penguin Life and what is their importance?

Clementine Ogilvy Spencer-Churchill, Baroness Spencer-Churchill, nee Hozier, lives from 1885 to 1977 and is the wife of Winston Churchill. Educated at home, Clementine is a naturally shy and solitary person. When she meets Winston Churchill, they are initially romantically uninterested in one another but Churchill needs a wife for his career. However, after they are married, they quickly develop a strong affection for one another.