"Both men knew that positioning the powerful Magii on the current eastern edge of the kingdom was done to help protect the new Emperor from a similar fate to the last."
Hmm, let's see. This definitely looks like it'll be easier to digest in smaller chunks. Maybe something along the lines of:
Both men knew why the powerful Magii were stationed on the eastern edge of the kingdom. The new Emperor preferred to avoid his predecessor's fate. 
ooh I like that