"Grateful for their generosity, Muhammad orders the land to be leveled, the graves dug up, and the palm trees cut down for timber to build a modest home. He envisions a courtyard roofed in palm leaves, with living quarters made of wood and mud lining the walls. But this will be more than a home. This converted drying-ground and cemetery will serve as the first masjid, or mosque, of a new kind of community, one so revolutionary that many years later, when Muslim scholars seek to establish a distinctly Islamic calendar, they will begin not with the birth of the Prophet, nor with the onset of Revelation, but with the year Muhammad and his band of Emigrants came to this small federation of villages to start a new society. That year, 622 C.E., will forever be known as Year 1 A.H. (After Hijra); and the oasis that for centuries had been called Yathrib will henceforth be celebrated as Medinat an-Nabi: "The City of the Prophet," or more simply, Medina. There"