Stockholm, the "Venice of the North," as it is called, was not then in existence; and little now remains of old Sigtun save ruined walls. But travellers may still see the three tall towers of the ancient town, and the great stone-heap, alongside which young Olaf drew his ships of war, and over which his pirate crew swarmed into Sigtun town, and planted the victorious banner of the golden serpent upon the conquered walls. For this fair young Olaf came of hardy Norse stock. His father, Harald Graenske, or "Greymantle," one of the tributary kings of Norway, had fallen a victim to the tortures of the haughty Swedish queen; and now his son, a boy of scarce thirteen, but a warrior already by training and from desire, came to avenge his father's death. His mother, the Queen Aasta, equipped a large dragon-ship or war-vessel for her adventurous son, and with the lad, as helmsman and guardian, was sent old Rane, whom men called "the far-travelled," because he had sailed westward as far as England and southward to Norvasund (by which name men then knew the Straits of Gibraltar). Boys toughened quickly in those stirring days, and this lad, who, because he was commander of a dragon-ship, was called Olaf the King--though he had no land to rule,--was of viking blood, and quickly learned the trade of war. Already, among the rocks and sands of Sodermann, upon the Swedish coast, he had won his first battle over a superior force of Danish war-vessels. Other ships of war joined him; the name of Olaf the Brave was given him by right of daring deeds, and "Skoal to the Viking!" rang from the sturdy throats of his followers as the little sea-king of thirteen was lifted in triumph upon the battle-dented shields. But a swift runner bursts into the gray hall of Sigtun. "To your ships, O King; to your ships!" he cries. "Olaf, the Swedish king, men say, is planting a forest of spears along the sea-strait, and, except ye push out now, ye may not get out at all!" The nimble young chief sprang from the upraised shields. "To your ships, vikings, all!" he shouted. "Show your teeth, war-wolves! Up with the serpent banner, and death to Olaf the Swede!" Straight across the lake to the sea-strait, near where Stockholm now stands, the vikings sailed, young Olaf's dragon-ship taking the lead. But all too late; for, across the narrow strait, the Swedish king had stretched great chains, and had filled up the channel with stocks and stones. Olaf and his Norsemen were fairly trapped; the Swedish spears waved in wild and joyful triumph, and King Olaf, the Swede, said with grim satisfaction to his lords: "See, jarls and lendermen, the Fat Boy is caged at last!" For he never spoke of his stout young Norwegian namesake and rival save as "Olaf Tjocke,"--Olaf the Thick, or Fat. The boy viking stood by his dragon-headed prow, and shook his clenched fist at the obstructed sea-strait and the Swedish spears. "Shall we, then, land, Rane, and fight our way through?" he asked.