Books with the Viking and slave romance

When I was little I read the Viking Quest series, which was an amazing book with this trope. Love the enemies to lovers and the character growth the characters go through. Looking for a YA book or series similar. It does HAVE to be Vikings and slaves but that’s just what I’ve liked in the past. Weird recommendation but idk, just like the drama I guess. Also want to add that I don’t need it to be a romance specifically, I also love the friendships and found family