31st century BC
Template:Short description Template:Centurybox The 31st century BC was a century that lasted from the year 3100 BC to 3001 BC.
Events
- c. 3100 BC: Polo (Template:LangxTemplate:Efn) was first played in Manipur state.Template:Efn<ref>Template:Cite book</ref><ref>Template:Cite web</ref>
- c. 3100 BC?: The Anu Ziggurat and White Temple are built in Uruk.
- c. 3100 BC?: Predynastic period (Neolithic) ends in Ancient Egypt.
- c. 3100 BC?: Early Dynastic (Archaic) period starts in Ancient Egypt.
- c. 3100 BC?: The first temple of Tarxien is in use by the Neolithic inhabitants of Malta.<ref>Cilia, Daniel (April 8, 2004). "Tarxien". The Megalithic temples of Malta. http://web.infinito.it/utenti/m/malta_mega_temples/tarxien/tarxien.html. Retrieved on 2007-07-07.</ref>
- c. 3100 BC?: First stage in the construction of Stonehenge.<ref>Template:Cite news</ref>
- c. 3100 BC: Oldest adobe building in the Americas was built in what is now Peru.
- c. 3100 BC – 2600 BC: Skara Brae, Orkney islands is inhabited.<ref name="RingWatson2013">Template:Cite book</ref>
- c. 3090 BC: Narmer (Menes) unifies Upper and Lower Egypt into one country; he rules this new country from Memphis.
- c. 3051 BC: The oldest currently living organism, a Great Basin bristlecone pine, undergoes germination in the White Mountains of California.
Inventions, discoveries, introductions
- Drainage and sewage system in the Indus Valley
- Dams, canals, stone sculptures using inclined plane and lever in Sumer and the Tigris–Euphrates Valley
- Copper was in use, both as tools and weapons.
- Senet, one of the oldest-known board games in the world is invented.
- c. 3100 BC – Invention of writing in Mesopotamia and Egypt
- The Sydney rock engravings date to around 3000 BC (Sydney, Australia).<ref>Template:Cite web</ref>