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SEA BEAST OF THE BOSPHORUS
For more than fifty years, a solitary whale known as Porphyrios was said to haunt the waters around Constantinople, the Bosphorus, and the Propontis.
First recorded by the 6th-century historian Procopius, Porphyrios attacked and sank ships travelling through the strait, earning a reputation as a great sea monster. Its exact species remains uncertain. Some later writers believed it may have been a sperm whale, while others have suggested an unusually large orca.
From Melville's Moby Dick, Chapter 45
"Now, in this history of his, Procopius mentions that, during the term of his prefecture at Constantinople, a great sea-monster was captured in the neighboring Propontis, or Sea of Marmora, after having destroyed vessels at intervals in those waters for a period of more than fifty years."
"A fact thus set down in substantial history cannot easily be gainsaid. Nor is there any reason it should be. Of what precise species this sea-monster was, is not mentioned. But as he destroyed ships, as well as for other reasons, he must have been a whale; and I am strongly inclined to think a sperm whale."
"And I will tell you why. For a long time I fancied that the sperm whale had been always unknown in the Mediterranean and the deep waters connecting with it."
“But I have every reason to believe that the food of the sperm whale-- squid or cutle-fish-- lurks at the bottom of that sea [Propontis], because large creatures have been found at its surface. If, then, you properly put these statements together, and reason upon them a bit, you will clearly perceive that, according to all human reasoning, Procopius’ sea monster, that for half a century stove the ships of a Roman Emperor, must in all probability have been a sperm whale."
WHY PORPHYRIOS MATTERS
Porphyrios may be remembered as a sea monster, but the story also offers a rare glimpse into the historical ecology of the Marmara region.
If the animal was a sperm whale, its presence would suggest that a large deep-diving predator once entered these waters from the Mediterranean. Herman Melville also wondered whether the Propontis contained the squid and cuttlefish such whales fed upon.
Neither the species nor its diet can be confirmed from the surviving account.
Even so, Porphyrios raises an important question: what kinds of marine life could the Marmara Sea once support, and how has that ecosystem changed since antiquity?
Centuries after Procopius recorded Porphyrios, stories of large and unusual marine animals continued to circulate around Constantinople and the Bosphorus.
In his book Constantinople, Skarlatos Byzantios wrote of seals in the strait, reports of whales entering from the Black Sea, sharks or dogfish, and mysterious lizard-like sea creatures whose bodies occasionally washed ashore.
He also recorded a local tradition that the skeleton of a great marine animal may once have hung near the walls of the imperial palace, close to the Byzantine acropolis. These remains were commonly remembered as “the bones of Sarayburnu” and may have later been associated with Porphyrios.
Whether or not the bones truly belonged to the famous whale, the story shows how marine wildlife became woven into the memory and folklore of the city. Encounters with unfamiliar animals were preserved not only in historical records, but in rumours, landmarks, and stories passed between generations.