Hymn Lyrics Search - Name That Hymn

I know the tune and I'm pretty sure I recorded it for my youtube channel, but I can't for the life of me remember the name of it or the first words to even
search. I'm wanting to make a new recording, I heard it in a French movie the other night in a church scene and wanted to find the score in my books Here is the segment from the movie https://www.youtube.com/watch?v=CNjqALxbYMY

Oddly enough I found the movie by accident, searching for the Swedish title of a hymn from a Swedish hymnal I have to see what historical/backgroun details there might be so as to include them with the video, it was very odd the movie's title was the search term!

It sounds like Fairest Lord Jesus (Ruler of All Nature) to me

Thanks for that, it does seem to be CRUSADERS' HYMN/St Elizabeth, I'll look in my books for it when I get home for lunch!

Update: that's the hymn, I have it in an older Presbyterian hymnal, I did a recording just now https://www.youtube.com/watch?v=ZTLsY8_FTwg
I added an updated video with pedals added https://www.dailymotion.com/video/x87ppkd