During the Abbasid Caliphate, significant mathematical advances included the development of algebra, largely attributed to the mathematician Al-Khwarizmi, who wrote the seminal work "Al-Kitab al-Mukhtasar fi Hisab al-Jabr wal-Muqabala." This period also saw the introduction of Hindu-Arabic numerals, which replaced Roman numerals and facilitated calculations. Additionally, scholars made progress in trigonometry, particularly in the use of sine and cosine functions, and developed methods for solving quadratic equations. These advancements laid the groundwork for future developments in mathematics and influenced European scholarship during the Renaissance.
Abbasid Caliphate was created in 750.
Abbasid Caliphate.
Abbasid caliphate -- Baghdad Ummayyad Caliphate- Cordoba
Damascus was the capital of the Uymmad Caliphate, the caliphate before the Abbasid one. The first capital of the Abbasid Caliphate was Kufa, then Baghdad, then Samarra, and then Baghdad once more (all four cities located in Iraq).
The Abbasid dynasty
before
Harun Al Rashid
The first Caliph Abou Bakr, then Omar. then Othman, then Aly
Hospitals
The Muslim Empire established by second Rashidoon Caliph Hazrat Umar RAU, the Ummayad Caliphate, The Abbasid Caliphate in Baghdad, and the Ummayad Caliphate in Spain
The Abbasid dynasty established their caliphate in Baghdad, which became the capital in 762 CE. The choice of Baghdad was strategic, as it was located at the crossroads of trade routes and offered a central position in the Islamic world. Under the Abbasids, the caliphate flourished culturally, scientifically, and economically, marking a golden age of Islamic civilization.
Some of the lasting accomplishments of the Umayyad and Abbasid empires were religious freedom, lower taxes, and the geographical growth of the caliphate.