Worth noting that one of those crusades you mention briefly managed to go not south but north and kill a whole fuckload of Jews in 1096, perhaps simply through some fated magnetic attraction wherein no one in Europe could do anything without slaughtering some Jews first. Then they stuck the darkly funny name "German Crusade" on it and went to Jerusalem.
Not that up on my Crusades - that might be next. We'll see. I feel pretty much in the dark as far as the Ottoman Empire, too. I do find it interesting that Castrillo Matajudios is just now getting around to changing its name - "Camp Kill the Jews" has such a lovely ring to it. At the same time, it's kind of indicative of the problem that "Camp Kill the Jews" was established by a bunch of Sephardic Jews trying for camouflage in a pogrom-filled Granada.