Long ago, a big group ruled. 

Long ago, a new group took power. They were called the Abbasids. They moved their home to Iraq. A leader built a city called Baghdad. 

The Abbasid Caliphate was a large empire. It began in the year 750. A new group took power from the Umayyads. This group was the Abbasid family. They were related to Muhammad.
The Abbasids moved their center to Iraq. A leader named al-Mansur built a new capital. He named it Baghdad. 
Baghdad became a very famous city. It was a place for science and art. This time is called the Golden Age of Islam. People from many lands came to learn there. They built schools like the House of Wisdom. 
As time went on, things changed. The empire faced many fights. Some parts of the land became independent. In the year 1258, the Mongols attacked Baghdad. This event ended the rule of the Abbasids. 
Later, a small branch of the family lived in Egypt. They had no real power. They held a symbolic role until 1517.
The Abbasid Caliphate was a huge and famous empire. It was the third Islamic caliphate to rule. The ruling family was named after Abbas ibn Abd al-Muttalib. He was the uncle of the prophet Muhammad. This family connection helped them gain support from many people. They rose to power in the year 750. This happened after a revolution overthrew the Umayyad Caliphate.
The Abbasids changed how the empire was run. They moved the center of power to Iraq. This was far from the old Umayyad lands. In the year 762, a leader named al-Mansur founded Baghdad. He named the city Madinat al-Salam, which means City of Peace. Baghdad sat right on the Tigris River. It became the main capital for most of their history. 
This era is often called the Golden Age of Islam. Baghdad became a world center for science and art. Many different kinds of people lived there together. They shared many different religions and cultures. The city had famous schools like the House of Wisdom. Scholars came from all over to study and invent new things. 
Power shifted many times during these years. The reign of Harun al-Rashid was a very famous time. After him, a civil war caused new divisions. The empire even built a new capital called Samarra in 836. Over time, many provinces became independent. Groups like the Samanids and Tulunids took control of different areas. Some leaders even held more power than the caliphs. 
The end of the empire came in a hard way. In 1258, the Mongols attacked the city of Baghdad. This event was led by Hulagu Khan. It brought an effective end to the Abbasid rule. A small branch of the family lived in Cairo later. They held a symbolic role but had no real power. This lasted until the Ottoman conquest of Egypt in 1517. 
The Abbasid Caliphate was the third major Islamic caliphate. It was ruled by the Abbasid dynasty from 750 to 1258. This dynasty was named after Abbas ibn Abd al-Muttalib. He was the uncle of the prophet Muhammad. This family connection gave the Abbasids great legitimacy. They used this claim to appeal to many Muslims. This helped them rise to power during a revolution.
The Abbasid Revolution began in the region of Khurasan. This area was in the east, far from Umayyad influence. The revolution was supported by many different groups. It included Arabs from Merv and the Yemeni faction. It also gained support from the mawali. The mawali were non-Arab Muslims. Under the Umayyads, they were often treated as a lower class. This support helped the Abbasids overthrow the Umayyad Caliphate in 750. The battle near the Great Zab river was a turning point. Abdallah, known as Abu al-'Abbas al-Saffah, won this battle. He then became the first Abbasid caliph.
After the revolution, the Abbasids moved the center of power. They moved the government from Syria to Iraq. This shift helped them connect with their Persian supporters. The early caliphs used several different locations for their administration. They used Kufa and al-Hashimiyya for a time. In 762, the second caliph, al-Mansur, founded Baghdad. He called it Madinat al-Salam, or the City of Peace. Baghdad sat on the Tigris River. It became the permanent capital for most of their history. 
The Abbasid era is famous for the Golden Age of Islam. This period included great advancements in science and culture. Baghdad became a global center for learning and invention. The city hosted important institutions like the House of Wisdom. The population was multi-ethnic and multi-religious. This diversity helped the city flourish as a center of knowledge. Scholars from many backgrounds lived and worked together there. 
Government became more organized during this time. The Abbasids used bureaucrats to manage the large empire. A powerful position called the vizier, or wazir, was created. The vizier acted as a high-ranking official or secretary. Under the Barmakid family, this role became very influential. The caliphs often delegated state affairs to these viziers. This changed the role of the caliph to be more ceremonial. The empire also grew more inclusive of non-Arab Muslims. This helped integrate Arab and Persian cultures into one state.
Power within the empire changed over the centuries. The reign of Harun al-Rashid is often seen as the peak. However, a civil war followed his death. This led to significant changes in the state. A new professional army was created. It was recruited mainly from Turkic slaves. In 836, the empire even built a new capital called Samarra. 
The empire faced a violent end in the 13th century. In 1258, the Mongols attacked Baghdad. This invasion was led by Hulagu Khan. The sack of Baghdad marked the end of Abbasid rule. The last caliph, al-Musta'sim, was executed during this time. A small branch of the dynasty lived in Cairo later. They held symbolic authority but had no political power. This lasted until the Ottoman conquest of Egypt in 1517. The final Abbasid caliph was al-Mutawakkil III.
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