The Abbasid architecture was particularly influenced by Sasanian architecture, which in turn featured elements present since ancient Mesopotamia.   The Christian styles evolved into a style based more on the Sasanian Empire , utilizing mud bricks and baked bricks with carved stucco. 
Jan 04, 2017 · The main difference between Abbasid and Umayyad empire is the developments that took place in the Islamic culture during them; Abbasid is considered as the golden age of Islamic culture since it saw numerous developments in art, literature, architecture, science and technology.
During the Iraqi Civil War, Samarra was in the "Sunni Triangle" of resistance. In medieval times, Samarra was the capital of the Abbasid Caliphate and is the only remaining Islamic capital that retains its original plan, architecture and artistic relics. In 2007, UNESCO named Samarra one of its World Heritage Sites.
Jan 16, 2020 · The Four Rightly Guided Caliphs (632–661) After Muhammad's death, the growing Islamic community was led by the al-Khulafa' al-Rashidun, the Four Rightly Guided Caliphs, who were all followers and friends of Muhammad.