So question, has Tyberia had any wars previous to Asgard's occupation?
EDIT: Also I might've missed this but how long has Asgard taken over Tyberia for?
First question: Tyberia had a civil war when a tyrannical lord-governor took power. That was 30 years prior to the events of this RP.
Second question: Asgard has been occupying Tyberia now for three months, going onto the fourth (where we begin).
Under the Revolutionary Handbook section, there is a 'Calendar' sub-section that details both of those events. Asgard's occupation took place in the month of Fallmourn, and the Tyberian civil war took place in the month of Oppurna.