A small label, made from hippopotamus ivory and attached to the sandals of one of the earliest known kings of Egypt. Neil MacGregor, Director of the British Museum, looks at what this label, with its hieroglyphs describing the king and his military conquests, can tell us about new trade links, the first handwriting, and new forms of leadership and beliefs. All of which emerge as large numbers of people come together in the world's first cities between 5,000 and 2,000 BC. (Duration: 14 mins)