This extraordinary catamaran ship so colossal it dwarfed even the grandest galleys of its time.

Envision a ship so colossal it dwarfed even the grandest galleys of its time, a floating behemoth conceived not for swift battle but as a breathtaking testament to imperial might. Around 220 BC, during the Hellenistic period, the ambitious vision of Egypt’s Ptolemy IV Philopator gave rise to the Tessarakonteres, a name derived from the Greek meaning forty-rowed. This extraordinary catamaran galley stretched an astounding 120 meters in length and 40 meters in width, making it one of the largest human-powered vessels ever to grace the seas. Its moniker, however, referred not to the number of oar rows, but to the staggering forty rowers who manned each vertical column of oars.

With a crew of approximately 6,000 individuals, including a staggering 4,000 rowers, the Tessarakonteres rivaled the operational scale of modern aircraft carriers. Designed primarily as a potent symbol of Ptolemaic supremacy rather than a practical instrument of war, its expansive decks could accommodate formidable catapults and even a small contingent of soldiers. Yet, this very grandeur came at a steep price. The sheer size of the vessel rendered it cumbersome and difficult to maneuver, and the costs associated with its maintenance and operation were exorbitant, even for the wealthy Ptolemaic kingdom.

While it undoubtedly inspired awe and projected imperial power across the ancient Mediterranean, the Tessarakonteres and other similar gigantic polyeres warships ultimately proved to be more spectacle than strategic asset.

Naval experts, such as Lionel Casson, have argued that their primary purpose was ceremonial display rather than effective combat deployment. Eventually, the impracticality and immense financial burden led Hellenistic naval forces to abandon these colossal creations. Their legacy remains not as formidable warships that dominated naval battles, but as awe-inspiring examples of ancient engineering ambition and the lengths to which rulers would go to project their power and prestige through sheer, unprecedented scale.