Krakatoa

The centuries-old activity of Krakatoa is reported in historical records. This volcano was formed two million years ago and has always shown great activity. 

An excerpt from the article 14 facts about Krakatoa

As early as the 3rd century AD, the Chinese described its violent eruptions. Its eruption around 416 caused the original volcano to collapse, resulting in the formation of a huge caldera (a large depression in the top of the volcano) 7 kilometers long. 

Other sources say that this event may have occurred in 535 and may have been the cause of the global cooling observed at that time in 535-536.