Roman Empire at its greatest extent
117 CEMajor
Trajan's conquests of Dacia and, briefly, Mesopotamia carry Rome to its largest size by his death in 117. His successor Hadrian gives up the eastern gains and fortifies the frontiers.
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Longest chain: The Big Bang → First stars ignite → Supernovae seed heavy elements → The Sun forms → Earth forms → First oceans → First life → Photosynthesis evolves → Great Oxidation Event → Complex cells (eukaryotes) → Multicellular life → First animals → Cambrian Explosion → First vertebrates → Jawed fish → Fish walk onto land → The amniotic egg → The Great Dying → Dinosaurs appear → Asteroid ends the dinosaurs → Early primates → Apes split from monkeys → Human line splits from chimpanzees → Walking upright → First stone tools → Genus Homo appears → Homo erectus → Control of fire → First fired clay figures → First pottery → Potter's wheel → The wheel → Spoke-wheeled chariot → Hittite Empire → Iron Age begins → Rome founded (traditional date) → Roman Republic founded → Caesar crosses the Rubicon → Assassination of Julius Caesar → Battle of Actium → Roman Empire begins → Pax Romana → Roman Empire at its greatest extent
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