I'm trying to track down a comic/graphic novel I read as a child (must've been between 2001 and 2008, and I estimate it wasn't older than from 1990) in a mid-sized local library.
First off, I read it in German, but it might very well have been a translation. There should be at least three softcover comic books, each of them approximately in A4 format.
The setting was medieval (Europe I think), and the protagonist as I remember him was sort of a Geralt of Rivia type, maybe tracking down something; a person, an apocrypha-like book, I'm not sure. But I think it was central that there was some knowledge not sanctioned by the Catholic church. I remember corrupt or downright evil clergymen. The whole scenery as I remember it was pretty dark, ravens played some role. (At least I remember ravens when I think of the comic.) The Book of Revelation was central I think.
The Four Evangelists also played a role. I don't think they appeared in the books, but their writings did. Maybe the individual comic books were even named after them. It wasn't a religious comic, they just took this medieval, Catholic, and very sinister background for the story. There were graphic elements, so not a children's comic, but rather for teens and grown ups. Monasteries, old cathedrals, and everything was very dark, lots of black in the scenery.
I think Jesus, or someone who claimed to be him, played a role. Maybe it was his brother, or an impostor, or even really Jesus himself? This is just a vague memory which might be completely wrong! As it turned out that person wasn't so nice as you would expect after reading the Bible, but rather violent and dark. I think that person still lived in the comics and the protagonist met him in medieval Europe.
Actually, it might be that there were templar knights in the comic. So maybe crusades and Jerusalem appeared as well.
You can check out The Book of Revelation (this is not the comic I'm looking for though, despite the overlap in topic) by Matt Dorff and Chris Koelle to get a feeling of the style of the comic I'm searching. The book covers also were in that style: lots of black and sinister.