Conspiracy in a medieval castle

A shadowy conspiracy in a medieval English castle's great hall at midnight, a fierce knight in chainmail and surcoat kneeling before a veiled lady in velvet kirtle and jeweled circlet, pledging loyalty with a hidden dagger, torches casting long shadows on stone walls adorned with tapestries of hunts and battles. A hooded monk lurks in the corner, scrolls of forbidden lore on oak tables. Tension of betrayal and chivalric love, moody low-light, aged textures of rust and wax. Gothic realism, high contrast, 8k, inspired by the illuminated manuscripts of the Middle Ages and Frank Frazetta's fantasy art