quality:corruption, linguistic:paraphrasing
Greco-Roman and Sasanian influences

Early Islamic architecture was influenced by two different ancient traditions:

The transition process between late Antiquity, or post-classical, and Islamic architecture is exemplified by archaeologic findings in North Syria and Palestine, the Bilad al-Sham (Levant region) of the Umayyad and Abbasid Caliphates. In this region, late antique, or Christian, architectural traditions merged with the pre-Islamic Arabian heritage of the conquerors.