catastrophic event—massive volcanic eruption—Doom of Valyria—massive tidal waves, eruptions, and earthquakes
Occurred in
A Song of Ice and FireDoom of ValyriaDothraki raidsthe Fourteen Flamesthe Doom of ValyriaGame of Thrones Season 5Revelation of Braavos126 BCValyria & the Dragons114 BCnearly four hundred years before the War of the Five Kings