For the next two centuries Sirmium was a place of little importance. At the end of the 8th century, Sirmium belonged to the Frankish State. The historical role of Sirmium increased again in the 9th century, when it was part of the Bulgarian Empire. Pope Adrian II gave St Methodius the title of Archbishop of Sirmium. After having adopted Christianity, the Bulgarians restored in Sirmium the Christian Episcopate, having in mind old Christian traditions and the reputation this city had in the ancient world.