Political event
Francisco Angmar would rule over increasing unrest in the empire, as the noble interior would increasingly come to odds with the expanding corpo-states coming from the Great Expanse. His rule would be cut short, when he was assassinated by a mid rim radical nationalist, leading to the first imperial crusades.
The Fourth Column would use this to sieze power, and this would be the first time an emperor would be chosen outside of the House of Stars and would instead see a member from the House of Glass.