In a chapel in the old crenellated church of Mary of Zion in Aksum, Ethiopia, is kept an object that emperors, patriarchs and priests have assured the world is the most important religious relic of all time: the Tabota Seyon, Ark of the Covenant, the Ark of Zion. This Ark is alleged to be no less than the Ark that Moses had constructed at Sinai and which destroyed the walls of Jericho. It was brought into Jerusalem by King David and installed in a magnificent temple by King Solomon. Then, the story goes, it came to Ethiopia of its own choice with the half-Ethiopian, half-Jewish son of Solomon...