Assertion: caliphate's power | /r/HasProperty | the sasanian empire
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text: It had destroyed what had been the two foremost military powers, the Sasanian Empire, which it absorbed completely, and the greater part of the Byzantine Empire, including Syria, Armenia and North Africa, although Leo the Isaurian stemmed the tide when he defeated the Umayyads at the Battle of Akroinon (739), their final campaign in Anatolia.