Related by context. Frequent words. (Click for all words.) 53 Inca Empire 49 Inca empire 49 Chachapoyas 48 Etruscans 48 Thracians 47 Hittites 46 Yuan Dynasty 46 Tang Dynasty #-# 46 Tlatelolco 46 Qin Dynasty 45 Incan 45 Byzantine era 44 Babylonia 44 Moche 44 Achaemenid 44 Sassanid 44 Anasazi 44 Palenque 44 Hiram Bingham 44 Mesoamerica 44 Spanish colonizers 43 Persian empire 43 Lambayeque 43 Wari 43 ancient Mayan 43 Umayyad 42 ancient Mesopotamia 42 Incas 42 Chaco Canyon 42 Song Dynasty 42 Vespasian 42 pre Incan 42 ancient Babylon 42 Olmec 42 Hasmonean 42 #BC [002] 42 Han Dynasty 42 Ancient Roman 42 Tenochtitlan 42 Abbasid 42 ancient civilization 42 Cilicia 41 Thracian 41 stele 41 Seljuk 41 Teutonic Knights 41 Jiroft 40 Palaeolithic 40 medieval fortress 40 Byzantines 40 archeological excavations 40 Chimborazo 40 Caral 40 Silesian 40 ancient 40 pre Columbian 40 Medes 40 Pictish 40 fifteenth century 40 Diocletian 40 Tikal 40 archeologists 40 Axum 40 Ptolemaic 40 Mycenaean 40 Sumerians 40 Akkadian 40 Radiocarbon dating 40 chicha 39 thirteenth century 39 Inca 39 Teotihuacan 39 Spanish conquistadors 39 #BC [001] 39 Tang dynasty 39 Herodium 39 Neolithic 39 Minoan 39 archeological digs 39 Bronze Age 39 Tubingen 39 archaeologists 39 Otzi 39 Medieval Warm Period 39 Nazca 39 Lisa Gherardini 39 Iron Age 39 Han dynasty 39 #AD [001] 39 Quetzalcoatl 38 Andes Mountains 38 Persian Empire 38 Arequipa 38 Ancient 38 fourteenth century 38 Tang Dynasty 38 Mayan 38 millennium BC 38 Mayans 38 Monte Verde 38 #BC [003]