In September 1964 we were able, after considerable difficulty, to reach the village al-Jinainah (al-Junainah) of Wādī Jirdān (which we had already visited earlier in the year along the spectacular new road from Wādī ‘Amaqīn). In the afternoon of that day and early next morning before leaving to return to ‘Ataq we made a brief survey of the tower known as al-Muqaiyad—the subject of this article. The visit being so hurried and part of the work being carried out after dark, we were not able to record everything in quite the detail we should have wished. We are much indebted to Lt.-Col. Adrian Donaldson, D.S.O., M.B.E., the CO., and Major S. F. B. Francis, T.D., then of the 5th Battalion, Federal Regular Army, the latter escorting us to the mouth of Wādī Jirdān at ‘Ayādh, and for the generous hospitality they gave us at ‘Ataq. We acknowledge with pleasure the courtesy of Shaikh Ruwais b. Miḥsin b. Ḥasan Namārī Hilālī, Federal Councillor, who permitted us to survey the ḥuṣn and supplied us with much information on it, as also to his brother Ḥasan b. Miḥsin.