You can get many cool medieval fantasy wallpapers from a game. Such as this one, a poster of The Dark Souls 3 game with a picture of a dragon and a knight. Dark Souls III is the latest installment in the Dark Souls universe. Developed by FROMSOFTWARE and published by Namco Bandai. Feel free to set this 1920×1080 medieval fantasy wallpaper as your desktop background.
Gallery The Dark Souls Medieval Fantasy Wallpaper