information:highlighting, linguistic:paraphrasing, linguistic:voice_change, structural:summarization, structural:expansion
Mongol domination and other instability

Tbilisi's "Golden Age" did not last for more than a century. In 1226, Tbilisi was captured by the Khwarezmian Empire under Shah Jalal al-Din, who massacred tens of thousands of Christians. The Khwarezmian occupation left Tbilisi's defenses severely devastated and prone to further attacks by Mongol armies. In 1236, after suffering crushing Mongol defeats, Georgia submitted to Mongol domination. The nation itself maintained a form of "semi-independence" and did not lose its statehood, but Tbilisi would be strongly influenced by the Mongols for the next century, both politically and culturally. In the 1320s, the Mongols retreated from Georgia, and Tbilisi became the capital of an independent Georgian state, once again. However, an outbreak of the Black Death struck the city in 1366.

Between the late 14th century and the late 18th century, Tbilisi would again be under the rule of various foreign powers. On several occasions, the city would even be completely burned and razed to the ground. In 1386, Tbilisi was invaded and sacked several times by the armies of Tamerlane. In 1440, the city was invaded and destroyed by Jahan Shah (the Shah of the town of Tabriz, Persia). From 1477 to 1478, the city was held by the Ak Koyunlu tribesmen of Uzun Hassan.