Who is the "Duke of Zhou" in history?

The first generation of Duke Zhou in history was named Ji Mingdan (about 1 100 BC), also known as Shu Dan, and was the fourth son of Ji Chang, the king of Zhou Wen. Because the fief was in Zhou (now Qishan North, Shaanxi Province), it was called Duke of Zhou or. He was an outstanding politician, strategist and thinker in the early years of the Western Zhou Dynasty. He is regarded as the founder of Confucianism and one of the most revered ancient saints in Confucius' life.