Why did timbuktu decline in influence?

The city began to decline after explorers and slavers from Portugal and then other European countries landed in West Africa, providing an alternative to the slave market of Timbuktu and the trade route through the world's largest desert. The decline was hastened when it was invaded by Morisco mercenaries armed with European-style guns in the service of the Moroccan sultan in 1591.

Timbuktu was at one time the center of the world for learning.

in his book, the riddle of the rosetta stone, james giblin talks about how there was a young british polymath and physician named thomas young who made a lot of advances on the deciphering of the rosetta stone. he says that even though young made a lot of mistakes because he was working under false assumptions, he also made huge contributions like deciphering three out of the seven symbols (more than anyone else before him). young published his findings and continued his good work but he wasn't able to progress much further due to some unfavorable situations, he still laid the basis for many other scholars and of course for the man who has been generally known to have deciphered it, jean-françois champollion

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