Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Benedictine Convent of St John at Müstair' has mentioned 'Empire' in the following places:
Occurrence Sentence Text Source
In the early Middle Ages the constant conflicts between the Frankish Kingdoms hindered the artistic progress previously enjoyed by the Romans when their empire was at its height.
The monasteries served as a training ground for missionaries, who were to be sent to the newly conquered areas of his empire and effect their conversion to Christianity.