alternatehistory.com

So, interestingly, I found this guy

https://en.wikipedia.org/wiki/George_VIII_of_Georgia

Who (despite his kingdom falling into disarray) was apparently going to be involved in a 120k strong crusade against the Ottoman Empire.

So what if, on the construction of Rumelihisari in 1451, the Crusade was given the go-ahead, and led by a competent commander (perhaps John Hunyadi is given command), with the explicit aims of establishing a Catholic Bulgaria, and restoring a Catholic Roman Empire - (with the premise that if Constantine doesn't agree, they put someone else in charge - Perhaps a Komnenid, or a Palialogoi from Montferrat) in Greece and the Anatolian Coasts.

Assuming the Crusade works together, and arrives in Ottoman territory in Feb of 1453, what sort of chances would they have? What routes of invasion would work best, and what impact would that have on the siege of Constantinople?
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