A little about Knights and Tournaments.

I would like to add something. It all started. As far as I know, the order was created by 4 people who called themselves the "Warriors of Christ." The idea of creating the order comes from the Bible: "I did not come to bring peace, but a sword." Well, then the Church and the Pope began to support the Order, people who wanted to join the order were found, gradually, it grew stronger, and it launched the first crusade at the command of the Pope.
It should be noted that the crusade brought both financial and religious benefits.

Added 2 minutes ago

May I ask... Did you start your story from the beginning? Or do you think that the concept of "crusader" appeared thanks to the Order of the Templars?

Of course, I agree with you that there is room for doubt here, because in addition to the Templars, the Hospitallers also participated.