Roman Empire Dual-World Poster

Create a cinematic dual-world editorial poster about historical_subject. Use a wide 16:9 landscape canvas with a dramatic vertical split in mood: the left half is chaotic battlefield action with black smoke, ash, red torn banners, spear silhouettes, fire sparks, and dark painterly ink splatter textures; the right half is a clear imperial encampment beside a blue lake and distant mountains under a bright sky, filled with orderly white tents, marching formations, standards, supply crates, watchtowers, and disciplined Roman soldiers. In the foreground, place exactly 3 mounted Roman cavalrymen: the central dominant commander rides a powerful dapple-gray horse toward the viewer, wearing ornate segmented armor, red cloak, gold-trimmed helmet with a red crest, holding a raised sword in his right hand and a large decorated oval shield on his left; behind him to the lower left are exactly 2 additional mounted legionaries with helmets, shields, spears, and red accents, partially obscured by smoke. Add exactly 2 prominent foreground standing soldiers on the lower right, seen from behind, watching the camp. Include multiple Roman standards, with one large red banner on the far right showing gold eagle decoration and pseudo-Latin legion text. Typography: on the upper right, set a monumental metallic gold Roman-serif title reading headline_text, with “THE” small above “ROMAN EMPIRE,” thin horizontal gold rules around the small word, engraved bevels, subtle shadow, and classical monumental spacing. Beneath it, add a small centered white editorial subtitle reading subtitle_text. Color palette: crimson red, antique gold, smoke black, steel gray, parchment beige, and deep imperial blue. Style: ultra-detailed epic historical concept art, dramatic lighting, realistic armor and horses, high contrast between war chaos and imperial order, sharp foreground detail with atmospheric depth, no modern objects, no watermark, no extra text beyond the title, subtitle, and banner markings.