I was playing as the Maya on the Earth map when I noticed Mali was getting close to a cultural victory. Just as I prepared for a war with him, the Shaka, Catherina and Julius Ceasar declared war on Mansa Musa.
And for good reason: Mansa Musa has put all his money into culture and as a result was highly underdeveloped. Eventually it was I who conquered the majority of his half-empty wonder-rich cities.