-
Period: 200 to 900
Maya
Central America
Invented the sun stone calendar. -
Period: 319 to 550
Gupta Empire
South Asia
Invented 0. -
Period: 330 to 1453
Byzantine Empire
Europe
Invented portable sundials. -
Period: 632 to 661
Muslim Empire
Arabia
Invented hospitals. -
Period: 794 to
Japan
East Asia
Invented different teas. -
Period: 830 to 1235
Ghana Empire
West Africa
Invented/participated in the gold trade. -
Period: 962 to
Holy Roman Empire
Europe
Invented the Julian calendar. -
Period: 1226 to
Mali Empire
West Africa
Invented an accurate calendar. -
Period: 1325 to 1516
Aztec
Central America
Invented certain medications. -
Period: 1368 to
Imperial China
East Asia
Invented chess. -
Period: 1438 to 1533
Inca
South America
Invented Quipu. -
Period: 1460 to
Songhai Empire
West Africa
Invented the first postal system in Africa.