Little more than a century ago, Bitish and Indian archaeologists began excavating the remains of what they soon realized was a previously unknown civilization in the Indus Valley. Straddling parts of Pakistan and India and reaching into Afghanistan, the culture these explorers unearthed had existed at the same time as those of ancient Egypt and Mesopotamia, and covered a much larger area. It was also astonishingly advanced: sophisticated and complex, boasting large, carefully laid out cities, a relatively affluent population, writing, plumbing and baths, wide trade connections, and even standardized weights and measures. In its heyday, from about BC 2600 to BC 1900, the Indus Valley Civilization created what may have been the world’s most egalitarian early complex society, defying long-held presumptions about the relationship between urbanization and inequality in the past. The most tantalizing feature of the ancient Indus Valley remains is what they appear to lack: any trace of a ruling class or managerial elite.