We would like to acknowledge the help and interest of the late Prof. G.S.P. Freeman-Grenville, the late Mr. James Kirkman, Dr. F.J. Berg, Dr. Farouk Topan, Prof. Yasir Sulayman and the late Dr. MacDonald of Edinburgh University. We are likewise indebted to Prof. Abdallah al-Shmahi of Ṣanʿāʾ University, Prof. & Mrs. J. Nielsen of Copenhagen and Birmingham Universities, Dr. Ahmed Hallak, Dr. Ishmael Baya for their kind assistance in bringing this to completion. We are beholden to Mr. C. Hobbs, BFA for his meticulous attention to the presentation of the maps. We owe many thanks to Brill Publishers, especially Maurits van den Boogert, Franca de Kort and Pieter te Velde for the gracious and obliging way they have been committed towards the completion of this publication.
Edinburgh & Birmingham October 2019
James McL. Ritchie MABD MPhil.
Sigvard von Sicard BABD ThD