chunk: In the course of the novel the Amulet transports the children and the Psammead to times and places where the Amulet has previously existed, in the hope that â somewhen in time â the children can find the Amulet's missing half. Among the ancient realms they visit are Babylon, Egypt, the Phoenician city of Tyre, a ship to "the Tin Islands" (ancient Cornwall), and Atlantis just before the flood. In one chapter, they meet Julius Caesar on the shores of Gaul, just as he has decided that Britain is not worth invading. Jane's childish prattling about the glories of England persuades Caesar to invade after all.