Look closely at Italy.
In the year 615, violent earthquakes in Italy were followed by "lues elephantiae." Baronius, vol. 8. 243. Baglivus relates that the great earthquakes in Italy in 1703, were succeeded by numerous diseases, especially opthalmia, erysipelas,etc
Venerable Bede describes comets as..
“stars with flames like hair.
They are born suddenly, portending a change of royal power or plague or wars or winds or heat”.