Or maybe they do know all about it ~
Hmmm...
The apocalyptic prophecies of Hildegard of Bingen, the next Doctor of the Church...At this time as a punishment for their sins Christians especially will attempt armed resistance to those who at that time are persecuting them, sensing no concern for the death of their bodies.
"A powerful wind will rise in the North carrying heavy fog and the densest dust by divine command and it will fill their throats and eyes so they will cease their savagery and be stricken with great fear.
Then within the Christian people the Holy Godhead will accomplish signs and wonders as if accomplished them at the time of Moses with the pillar of cloud and as Michael the archangel did when he fought the heathen for the sake of the Christians. Because of Michael's help Gods faithful children will march under his protection. They will decimate their foes and achieve victory through Gods power As a result of this a large number of heathens will join Christians in true faith and they will say The God of the Christians is true God because such wondrous works have been accomplished among the Christians .
Wasn’t it Krakatau that is blamed for the climate anomaly of 535 AD through 541 AD, not Katla?