A little about Knights and Tournaments.

A small clarification: Alexander became a vassal of the Horde, in exchange for protection, and the Mongols didn't care what the conquered peoples believed, unlike the Crusaders. By the way, the Crusaders also wanted to involve the Mongols in the Crusades. In 1244, the French King Louis IX established contact with the Mongols, seeing them as allies in the fight against Egypt. However, it didn't go beyond exchanging pleasantries and proposing that the Mongols convert to Christianity, and the French recognize the power of the Mongol Khan. Here's another interesting fact: Did you know that "Crusades" were also undertaken from the side of Rus'? More precisely, one prince, Andrei Bogolyubsky, participated in them, but since Jerusalem was far away, he decided to attack the Volga Bulgaria (an Islamic state on the Volga), which was much closer. He attacked it a couple of times and would have attacked again if he hadn't been killed in a conspiracy.