“Jerusalem, 1000-1400: Every People Under Heaven,” at the Metropolitan Museum, is a captivating show of some two hundred objects from the era of the Crusades. There are manuscripts, maps, paintings, sculptures, architectural fragments, reliquaries, ceramics, glass, fabrics, astrolabes, jewelry, weapons, and, especially, books—in nine alphabets and twelve languages. The works, from sixty lenders in more than a dozen countries, express the Jewish, Islamic, and Christian cultures of the time, the three great Abrahamic faiths sharing a city holy to them all, when they weren’t bloodily contesting it. The installation is lovely: rooms in gray and blue are filled with a cumulative haze of spotlights, designed not for drama but for ease of attention; the show, though immense, won’t exhaust you. There are mural-like video projections of the city today and…
