alternatehistory.com

In 13 December 115 AD a 7.5 magnitude earthquake struck the city of Antioch turning most of the city to ruins. Emperor Trajan and Hadrian were caught in the earthquake but they managed to escape only with light injuries (Trajan had to jump out from a window in order to get out of his collapsing house... which is impressive considering his age and health).

WI both the Emperor and his heir died that day? Does their deaths throws the Empire into a succession crisis?
How is history affected without Hadrian (and assuming that Good Emperors line stops there)?
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