William, Archbishop of Mainz/Talk

This sentence isn't English yet, nor is it clear enough for me to revise into English: Moravia, Bohemia stood the previous 100 years under Regensburg?. Does the author mean that Moravia and Bohemia are merely synonyms for each other (which isn't true)? Does the author mean that there was a bishop of Bohemia and a bishop of Moravia (because it doesn't say that, either)? --MichaelTinkler