For a bit of background, Usman ibn Huwayrith, operating within political, societal, economic, and religious changes within the Arab world that would allow the rise of Islam, was an Arab of the Quraish tribe that converted to Christianity and revolted against idol worship in Mecca, during a festival, he and three relatives entered into a secret oath in which idol worship would be renounced in favor of Abrahamic religions, in particular Christianity, basing their decision on the belief that idol worship had no spiritual or textual basis. I don't want this to be a classic "No Islam" scenario, that has been done millions of times. He visited Byzantium in around 590 and entered into contact with a high-ranking Byzantine official, known simply as Caesar, according to the sources that have come down to us, convincing him that assisting him in his plan to be installed king of Mecca would help suppress the advance of the Sassanids. Caesar bestowed upon him the title of al-Bitriq, reserved for those who displayed military prowess, and while at Caesar's court, Huwayrith converted to Christianity. Obtaining Caesar's support, he attempted to become king of Mecca, and promised the merchant class of the city that they would have a much better time trading with Byzantine Syria being actually a part of the empire and it's economic network, and met with initial success, until the Meccans suddenly decided to reject his kingship. Suppose he succeeded somehow and doesn't get immediately overthrown. I doubt that a small-scale intervention in a peripheral area outside the empire would cause any serious butterflies for the Byzantine-Sassanid war of 602-628, which should presumably still happen on schedule after Phocas kills Maurice and Khosrau invades to support his ally. So what would occur if Huwayrith succeeded?
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