Assertion: caliph | /r/HasProperty | ʿabdullāh al-mahdī
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Source sentences:
text: Al-Mahdiyya, the first capital of the Fatimid dynasty, was established by its first caliph, ʿAbdullāh al-Mahdī (297–322 AH/909–934 CE) in 300 AH/912–913 CE.