The Churchills, father and son, had close friendships with prominent, talented Jews. One was Nathaniel Mayer “Natty” Rothschild, First Baron Rothschild, head of the British branch of the famous banking family. He was the first Jewish member of the House of Lords. Another was Sir Ernest Joseph Cassel, also of Jewish origin, though he became a Catholic in 1880. A renowned merchant banker and financier, Sir Ernest was young Winston’s mentor, financial consultant and lifelong friend.