Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Stećci Medieval Tombstone Graveyards' has mentioned 'Circa' in the following places:
Occurrence Sentence Text Source
The chronology established by Marian Wenzel assumes they developed from the plate headstones, the oldest one dating back to 1220 (the first were probably erected sometime in the mid-12th century[1]), the monumental ones emerged somewhere around 1360, those with visual representations around 1435xe2x80x931477, and that total production ended circa 1505.