During the reign of the Doge Gradenigos there lived in Venice an old fisherman, Cecco by name. He had been an unusually strong man, and was still very strong for his age, but lately he had given up work and left it to his two sons to provide for him. He was very proud of his sons, and he loved them--ah, signor, how he loved them! Fate had so ordered it that their bringing up had been almost entirely left to him. Their mother had died early, and so Cecco had to take care of them. He had looked after their clothes and cooked their food; he had sat in the boat with needle and cotton and mended and darned. He had not cared in the least that people had laughed at him on that account. He had also, quite alone, taught them all it was necessary for them to know. He had made a couple of able fishermen of them, and taught them to honour God and San Marco. 'Always remember,' he said to them, 'that Venice will never be able to stand in her own strength. Look at her! Has she not been built on the waves? Look at the low islands close to land, where the sea plays amongst the seaweed. You would not venture to tread upon them, and yet it is upon such foundation that the whole city rests. And do you not know that the north wind has strength enough to throw both churches and palaces into the sea? Do you not know that we have such powerful enemies, that all the princes in Christendom cannot vanquish them? Therefore you must always pray to San Marco, for in his strong hands rests the chains which hold Venice suspended over the depths of the sea.' And in the evening, when the moon shed its light over Venice, greenish-blue from the sea-mist; when they quietly glided up the Canale Grande and the gondolas they met were full of singers; when the palaces shone in their white splendour, and thousands of lights mirrored themselves in the dark waters--then he always reminded them that they must thank San Marco for life and happiness. But oh, signor! he did not forget him in the daytime either. When they returned from fishing and glided over the water of the lagoons, light-blue and golden; when the city lay before them, swimming on the waves; when the great ships passed in and out of the harbour, and the palace of the Doges shone like a huge jewel-casket, holding all the world's treasure--then he never forgot to tell them that all these things were the gift of San Marco, and that they would all vanish if a single Venetian were ungrateful enough to give up believing in and adoring him. Then, one day, the sons went out fishing on the open sea, outside Lido. They were in company with several others, had a splendid vessel, and intended being away several days. The weather was fine, and they hoped for a goodly haul.