Cinematic Sparta Helmet Poster

Create a vertical cinematic historical poster for ancient_city. Use a dark, minimalist composition with a deep burgundy-black textured parchment background, subtle vignette, and gritty film-grain finish. At the top center, place one large title line reading headline_text in widely spaced, elegant carved Roman serif capitals, aged ivory color. Directly beneath it, add one small subtitle line reading subtitle_text in tiny spaced capitals with centered dot separators. In the lower center, show exactly one ancient Spartan bronze Corinthian helmet, weathered and rust-red, facing forward, with black hollow eye openings, a narrow nose guard, worn metallic rim highlights, and exactly one tall dark red horsehair crest rising from the top. The helmet sits in dramatic low-key lighting, casting a long black shadow to the lower right. At the very bottom, add one small italic tagline line reading tagline in aged ivory. Keep the design sparse and symmetrical, with large empty negative space between the title and helmet, no people, no extra objects, no logos, and no modern elements. Use a premium ancient-history movie-poster style, moody chiaroscuro lighting, realistic texture, and a 2:3 vertical poster aspect ratio.