Still, that's history.
But I do think that they were very historically significant, and they were 100 years with Jerusalem as the capital of the Latin Kingdom (as you say, they never used the word Palestine, nor even seem to have known it.) Their contribution was tremedous, can still be seen, and they also brought a lot of Eastern culture back to the West, (including according to tradition, a secret learning acquired by the Knights Templar.)
So I do think that they have to be included in accounts of the line up to the history of Palestine. As to where they fit in with Scripture, I am not sure.
Templar flag.