From my experience, teaching a unit on Medieval Times is one of the best parts of the curriculum. There are so many ideas, activities that can be done. I find that organizing my ideas for the upcoming unit helps me plan out my activities and see the cross curricular aspects of my lessons. The concept map below lists some activities/learning opportunities I have done in the past.
The 3AM Teacher: http://www.teacherspayteachers.com/Store/The-3am-Teacher