○○○ Justinian ⪢⪢
Named after the emperor at the time, the Pague of _____ is estimated to have wiped out about half of Europe's population.
http://qindex.info/i.php?x=7207

○○○ erosion ⪢⪢
The reason we don't see the asteroid impacts on earth the same way we see the craters on the moon is because on earth those craters have been wiped away by the action of weather and erosion and weathering and the movement of tectonic plates.
http://qindex.info/i.php?x=10140

◌◌◌ plague
Named after the emperor at the time, the Plague of Juastinian is estimated to have wiped out about half of Europe's population. ￫ Yersinia Pestis, impetus, Justinian, moniker, sanitation, catapult, Byzantine, vulnerable
http://qindex.info/i.php?x=4070

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