Al-Mansur vs Tokhtamysh

Al-Mansur established a centralized bureaucracy modeled on Sassanid practices, creating the office of the vizier and a postal service (barid). These reforms improved tax collection, communication, and governance across the vast Abbasid Empire.

Al-Mansur sponsored the translation of Greek, Persian, and Indian scientific and philosophical works into Arabic. This initiative laid the foundation for the Abbasid translation movement, which later flourished under the House of Wisdom and preserved classical knowledge.

After the death of his brother As-Saffah, Al-Mansur became the second Abbasid caliph. He systematically eliminated rivals, including the powerful Barmakid family and other potential claimants, to secure his rule and establish the Abbasid dynasty as the sole ruling house.

Al-Mansur faced a major rebellion led by Muhammad al-Nafs al-Zakiyya, a descendant of Ali, who claimed the caliphate. The revolt was crushed by Abbasid forces, and Muhammad was killed, solidifying Abbasid control against Alid claimants.

Al-Mansur ordered the construction of the new capital city, Baghdad, on the west bank of the Tigris River. The city was designed as a circular 'Round City' and became the administrative and cultural center of the Abbasid Caliphate, replacing the previous capital at Al-Hashimiya.

Tokhtamysh, with the support of Timur, defeated the rebellious general Mamai and reunified the Golden Horde under his rule. He restored the Horde's authority over the Russian principalities, ending a period of fragmentation.

Tokhtamysh led a campaign against the Grand Duchy of Moscow. He besieged and captured Moscow, burning the city and massacring its inhabitants. The victory reasserted Mongol dominance over the Russian principalities.

Tokhtamysh invaded Timur's territory in Transoxiana, starting a war between the two Mongol rulers. Timur retaliated by invading the Golden Horde, defeating Tokhtamysh at the Battle of the Kondurcha River in 1391.

Timur decisively defeated Tokhtamysh at the Battle of the Terek River. The victory destroyed Tokhtamysh's army and led to the sack of Sarai, the capital of the Golden Horde. Tokhtamysh fled and never regained power.

After his defeat by Timur, Tokhtamysh fled to the Grand Duchy of Lithuania. He was killed in a skirmish with a rival Mongol faction near Tyumen. His death marked the end of the last attempt to reunite the Golden Horde.