TIL the Empire of Mali ruined Egypt's economy for 12 years by giving them too much gold. The ruler Mansa Musa was exceptionally wealthy. During his pilgrimage to Mecca with an entourage of 12000 servants and hundreds of camels with gold,  he passed through Egypt and generously donated gold to everyone.  The local market was not prepared for the sudden influx of wealth,  merchants rushed to adjust the prices due to the rise in gold supply. This imbalance between supply and demand, contributed to a massive inflation that went on for over a decade. Mansa Musa ruled Mali until 1337.