Conversation so far:
How did Matthew Paris become a historian?
From 1235, Matthew Paris continued the history on the plan which his predecessors had followed.
What was the plan Matthew Paris' predecessors has followed?
Roger of Wendover's best-known chronicle, called the Flores Historiarum (Flowers of History), is based in large part on material which already existed at St Albans.
Was being a historian related to church for Matthew Paris?
The Flores Historiarum is the name of two different Latin chronicles by medieval English historians that were created in the 13th century, associated originally with the Abbey of St Albans.
What did Matthew Paris do in 1257?
In 1257, in the course of a week's visit to St Albans, Henry III kept the chronicler beside him, and guided my pen with much goodwill and diligence.“
What else did Matthew Paris do in 1257 beside his week's visit to St. Albans?
Matthew Paris tended to glorify Emperor Frederick II and denigrate the Pope.
What happened with Matthew Paris' Chronica majora when he was done?
The Chronica Majora continues to be mined for its coverage of the Mongol invasions and its detailed report of the conflict between Fredrick II and successive popes
What were Matthew Paris' real feelings about Emperor Frederick II?
However, in his Historia Anglorum, Matthew Paris displays a highly negative view of Emperor Frederick II, going as far as to describe him as a tyrant who committed disgraceful crimes.

Question: why was it dangerous
Self-contained rewrite: Why was describing Emperor Frederick II as a tyrant dangerous for Matthew Paris?