Generate a visually striking portrait of Emperor Caligula that captures his commanding presence and imperial stature. The image should have an intense and dramatic atmosphere, emphasizing abstract colors and textures. Apply film grain to add a vintage feel and evoke a sense of antiquity. Highlight the intricate details such as his skin pores, wrinkles, and dusty atmospheric haze surrounding him. Introduce a subtle vignetting effect to frame the Emperor in the center. Set the intensity of wrinkles to 0.2, reflecting his age and the weight of his rule. Depict Caligula with a serious expression, showcasing his authority and power as a Roman Emperor. Dress him in regal attire, such as a laurel wreath crown and a majestic royal robe adorned with symbols of his imperial status. Consider adding Roman architectural elements in the background to create a sense of grandeur and opulence. Let the image exude a sense of historical accuracy and authenticity, presenting Caligula as a formidable figure from ancient Rome.

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