Murrah ibn Ka`b (مرة بن كعب) ibn Luay ibn Ghalib ibn Fihr ibn Malik is a man from Quraish tribe, supposed to live in the 4th century. He is the sixth-in-line of Muhammad’s grandfathers. He is the common ancestor of Muhammad’s all four grandparents. He is also the common ancestor of six of Muhammad’s eight great-grandparents. His mot....