Why does submariner say imperius rex?

Sub-Mariner, also known as Namor, uses the phrase "Imperius Rex" as a declaration of his royal status and authority as the ruler of Atlantis. The phrase, which translates to "Imperious King," emphasizes his power and sovereignty over his underwater kingdom. It often serves as a rallying cry for his allies and a warning to his enemies, reinforcing his identity as a formidable leader in the Marvel Universe.