Assertion: city's history | /r/HasProperty | one of sporadic rivalry
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Source sentences:
text: The city’s history as a Muslim centre is one of sporadic rivalry between the heterodox Zaydī (see Zaydiyyah) imams (leaders) and rival dynasties; the Zaydī imamate, whose original capital was at Ṣaʿdah in the north, lasted, with frequent interruptions, from the 9th century to 1962.