Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Rila Monastery' has mentioned 'Tsar' in the following places:
Occurrence Sentence Text Source
It is traditionally thought that the monastery was founded by the hermit St. Ivan of Rila, whose name it bears, during the rule of Tsar Peter I (927-968).
Large donations were made by almost every tsar of the Second Bulgarian Empire up until the Ottoman Conquest, making the monastery a cultural and spiritual centre of Bulgarian national consciousness that reached its apogee from the 12th to the 14th century.