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The Byzantine Empire declined after Islam spread. The words "Islam spread" are nebulous. If the question is referring to the Rise of Islam period, when Mohammed and the Rightly-Guided Caliphs were spreading Islam, then yes, the Byzantine Empire decline after these events. If, however, you are referring to the Seljuk and Ottoman conquests of Anatolia nearly 600 years later which eventually ended the Byzantine Empire, the Empire was in decline long before these armies trampled the Byzantines to the ground. The answer is more complex than the above answers would purport. See the link below for another relevant answer.
The Abbasids, as the ones from the Islamic Empire.
The defeat by the byzantine empire in 717 ; intertibal feuding , discontent among non Arab Muslim converts , and failure of financial reforms eventually led to their unseating by the " abbasid dynasty ".
Abbasid caliphate -- Baghdad Ummayyad Caliphate- Cordoba
Hulagu Khan of the Mongols defeated Abbasid Caliph Al-Musta'sim in 1258 in Baghdad. He completely conquered the Abbassid Empire and made sure to raze every city to the ground that gave him one iota of resistance.
The abbasid caliphs built a huge standing army; they encouraged all people to take part in government; and moved the capital to Baghdad.
The Byzantine Empire declined after Islam spread. The words "Islam spread" are nebulous. If the question is referring to the Rise of Islam period, when Mohammed and the Rightly-Guided Caliphs were spreading Islam, then yes, the Byzantine Empire decline after these events. If, however, you are referring to the Seljuk and Ottoman conquests of Anatolia nearly 600 years later which eventually ended the Byzantine Empire, the Empire was in decline long before these armies trampled the Byzantines to the ground. The answer is more complex than the above answers would purport. See the link below for another relevant answer.
After the decline of the Roman Empire there was a demographic decline and fewer buildings erected and the cubit eventually became the Yard.
abbasid were dirty hoes, mali were haters.
The Abbasids, as the ones from the Islamic Empire.
Caliphs were successors of Muhammad as spiritual and temporary leader of the Muslims. They administered the empire by keeping everyone in line.
The once mighty Roman Empire eventually went into decline, leaving Rome open to invasion by foreign forces.
ruhith azad
Baghdad
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The rise of nationalism in the Empire eventually caused the break-down of the Ottoman millet (confessional community) concept.