Medieval Houses of God, or Ancient Fortresses? Volume 57 Number 6, November/December 2004 by David Keys Cambridge archaeologist has redated the church of the archangel Gabriel, previously believed to have been carved from the rock at Lalibela, Ethiopia, around A.D. 1200, to between A.D. 600 and 800. The church may originally have been built as a fortress. (Courtesy Museum of Anthropology and Archaeology, Cambridge) Investigations in Lalibela, Ethiopia, are revealing that Africa's most important historical Christian site is much older than previously thought. Up until now, scholars have regarded the spectacular complex of 11 rock-cut churches as dating from around...