Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Samarra Archaeological City' has mentioned 'Caliph' in the following places:
Occurrence Sentence Text Source
A supplementary canal, the Qatul Abi al-Jund, excavated by the Abbasid Caliph Harun al-Rashid, was commemorated by a planned city laid out in the form of a regular octagon (modern Husn al-Qadisiyya), called al-Mubarak and abandoned unfinished in 796.
In 836 CE, the Abbasid Caliph Al-Mu'tasim founded a new capital at the banks of the Tigris.
The city was further developed under Caliph al-Mutawakkil, who sponsored the construction of lavish palace complexes, such as al-Mutawakkiliyya, and the Great Mosque of Samarra with its famous spiral minaret or Malwiya, built in 847.
Samarra remained the residence of the caliph until 892, when al-Mu'tadid eventually returned to Baghdad.