In 1955 the winds of change were beginning to blow across the Sultanate of Oman, a hitherto truly medieval state. Rumours of subversion mingled with the unsettling smell of oil to propel the Sultan on a royal progress through the desert hinterland, from his southern capital of Salala to the northern capital of Muscar. It was an historic journey - the first crossing of the Omani desert by motorcar. Jan Morris accompanied His Highness Sultan Said bin Taimur as a professional observer, and was inspired by the experience to write her major work of imperial history, the Pax Britannica trilogy.