"And when he have come to Port Kar, what then?" asked Tab. I looked at him evenly. "Then," said I, "paint my ships green." Green, on Thassa, is the color of pirates. Green hulls, sails, oars, even ropes. In the bright sun reflecting off the water, green is a color most difficult to detect on gleaming Thassa. The green ship, in the bright sun, can be almost invisible. "It will be done," cried Tab. There were more cheers from the men about."

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"Port Kar, squalid, malignant Port Kar, scourge of gleaming Thassa, Tarn of the Sea, is a vast disjointed mass of holdings, each almost a fortress, piled almost upon one another, divided and crossed by hundreds of canals. It is, in effect, walled, though it has few walls as one normally thinks of them. Those buildings which face outwards, say, either at the delta or along the shallow Tamber Gulf, have no windows on the outward side, and the outward walls of them are several feet thick, and they are surmounted, on the roofs, by crenelated parapets." 
Raiders, p. 103

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Facing the gleaming Thassa by way of the Tamber Gulf, is the crowded, squalid, malignant city at the mouth of the Vosk Delta called Port Kar. It is sometimes referred to as the Tarn of the Sea. It is the only city on Gor that recognizes a Caste of Thieves, and it is the only city on Gor actually built by slaves under the whip of their Masters. The city is a mass of holdings, each almost a fortress, all crossed and divided by hundreds of canals.Port Kar is ruled by a several conflicting Ubars, and, under them, the Council of Captains who are responsible for maintaining and managing the great arsenal, as well as the fleets of Port Kar. Her name is a synonym in Gorean for cruelty and piracy. 
Book 6: Raiders of Gor, pages 6 and 103 

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I did not know if the victory we had won, for victory it surely seemed to be, was decisive or not, but I well knew that the twenty-fifth of Se'Kara, for that was the day on which this battle had been fought, would not be soon forgotten in Port Kar, that city once called squalid and malignant, but which had now found a Home Stone, that city once called the scourge of gleaming Thassa, but which might now be better spoken of, as she had been by some of her citizens aforetimes, as her jewel, the jewel of gleaming Thassa. 
RAIDERS OF GOR, Page 280

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I was in the delta of the Vosk, and making my way to the city of Port Kar, which alone of Gorean cities commonly welcomes strangers, though few but exiles, murderers, outlaws, thieves and cutthroats would care to find their way to her canalled darknesses. 
RAIDERS OF GOR, Page 6

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It was Luma, the chief scribe of my house, in her blue robe and sandals. Her hair was blond and straight, tied behind her head with a ribbon of blue wool, from the bounding Hurt, died in the blood of the Vosk sorp. She was a scrawny girl, not attractive, but with deep eyes, blue; and she was a superb scribe, in her accounting swift, incisive, accurate, brilliant; once she had been a paga slave, though a poor one; I had saved her from Surbus, a captain, who had purchased her to slay her, she not having served him to his satisfaction in the alcoves of the tavern; he would have cast her, bound, to the swift, silken urts in the canals. I had dealt Surbus his death blow, but, before he had died I had, on the urging of the woman, she moved to pity, carried him to the roof of the tavern, that he might, before his eyes closed, look once more upon the sea. He was a pirate, and a cut-throat, but he was not unhappy in his death; he had died by the sword, which would have been his choice, and before he had died he had looked again upon the gleaming Thassa; it is called the death of blood and the sea; he died not unhappy; men of Port Kar do not care to die in their beds, weak, lingering, at the mercy of tiny foes that cannot see; they live often by violence and desire that they shall similarly perish; to die by the sword is regarded as the right, and honor, of he who lives by it. 
MARAUDERS OF GOR, Pages 1-2

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"What shall we do now, Captain," asked Clitus, of me.
"Return to Port Kar," I said. "As I recall, I have waiting for me there a galley, heavy class, for my work in Cos."
"True!" said Thurnock.
"And when he have come to Port Kar, what then?" asked Tab.
I looked at him evenly. "Then," said I, "paint my ships green."
Green, on Thassa, is the color of pirates. Green hulls, sails, oars, even ropes. In the bright sun reflecting off the water, green is a color most difficult to detect on gleaming Thassa. The green ship, in the bright sun, can be almost invisible."It will be done," cried Tab.
There were more cheers from the men about.
...
And thus it was that the ships to Bosk, he of Port Kar, came to be painted green. 
Raiders “Surely a polity, even if it be one of pirates, if it is to survive, if it is to protect itself, must establish some forms of justice and law within its own precincts?”
“One would suppose so,” I said. “Even if it is of the rack and spear.”
“I would suppose so,” I said.
Renegades

"Samos wore the blue and yellow robes of the Slaver. Indeed, he was First Slaver of Port Kar, and First Captain in its Council of Captains, which council, since the downfall of the four Ubars is sovereign in Port Kar. I, too, was a member of the Council of Captains, Bosk, of the House of Bosk, of Port Kar. I wore a white robe, woven of the wool of the Hurt, imported from distant Ar, trimmed with golden cloth, from Tor, the colors of the Merchant. But beneath my robe I wore a tunic of red, that color of the warriors."

"He had a large, squarish head, short-cropped white hair. His face was dark from the sun, and wind-burned, and sea-burned. There were small, golden rings in his ears. He was a pirate, a slaver, a master swordsman, a captain of Port Kar. "

 

The Registry has been dissolved, those listed as of 11/17/2017 maintain their dice.

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