Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Site of Palmyra' has mentioned 'Citadel' in the following places:
Occurrence Sentence Text Source
[308] The Burids transformed the Temple of Bel into a citadel in 1132, fortifying the city,[309][310] and transferring it to the Bin Qaraja family three years later in exchange for Homs.
The tower tombs and the citadel are vulnerable to minor earthquakes and lack of conservation.