of copper, tin, ivory, Syrian, Cypriot and Mycenaean vases, and pieces of elephant and hippo ivory. The Acropolis of Athens is developed: towards the end of the century, a Cyclopean wall four to six meters thick, known as the “pelasgic wall” (Pelargikon), is constructed, as well as a well to supply the citadel with water. Linear B tablets are created in Pylos. c. 1300–1200 BC: Approximately 4,000 men fight a battle at a causeway over the Tollense valley in Northern Germany, the largest known prehistoric battle north of the Alps. c. 1300–500 BC: The Lusatian culture in Poland, parts of the Czech Republic and Slovakia, eastern Germany and northern Ukraine. c. 1250–850 BC: The Urnfield culture, characterized by vast cemeteries housing urns with the ashes of the deceased and offerings, marks the Late Bronze Age in Western Europe. c. 1250–1000 BC: The culture of Pantalica develops inland in Sicily. 1225–1190 BC: Late Helladic IIIB2 in mainland Greece. The perimeters of the defense systems of the Mycenaean palaces (Mycenae, Tiryns, Midea) are widely extended, a sign that insecurity is increasing. The end of the period was marked by widespread destruction on most sites: Mycenae, Tyrinth, Midéa, Thebes, Orchomenus, Dimini, and Pylos, whose unfortified palaces have not been rebuilt. Sovereign states List of sovereign states in the 13th century BC. References -7 -87