While engaged in locust investigations in Ethiopia between 1942 and 1945 I found ample opportunity to indulge my favourite hobby—the study of Christian architecture and antiquities. I knew, before coming to the country, that Ethiopia was little-explored and probably a fruitful field. I had heard of the pre-Christian monuments at Aksum, and of the extraordinary rock-hewn churches of Lalibela, both of which have been long (if not widely) known. But in the end the antiquities that came to light far surpassed my expectations, and I had the satisfaction of visiting many remarkable monuments, which have rarely been seen by Europeans, hidden away in the mountain fastnesses of the northern highlands. One or two Italian archaeologists had, it is true, begun to pay attention to some of these buildings, but I believe no connected account of the early Ethiopian style of architecture has yet been attempted, I propose in this summary article to confine myself mainly to the internal history of the monuments, only touching upon the more difficult question of the ultimate sources of the style.