I would like to go with a medieval roleplay think early middle ages to around the Tudor timeframe. It rough and is a bit simple, it can be expanded upon. While the plot isn't set in stone I want our characters to be a Duke and a Duchess. Your character inherited the duchy from her father being the sole heir. She could be betrothed to another but being on her own has broken it said betrothal and has in secret joined with another Duke who is a claimant to throne of the ailing king. Planning on taking the throne by force when the king dies.