It was up there, in the highest story, that Johannes had been a prisoner nearly two years. The windows needed no gratings, for it would be death to leap out, and no one could climb up to get in. The pier below the tower sloped to the stream, and its base ran out so far that no man could have jumped clear of it from above--even if he dared the desperate risk of striking the water. Bertrandon de la Broquière saw it, years afterwards, when Zeno was an old man, and you may look at a good picture of it in his illuminated book. A solitary fisherman was perched on the edge of the sloping pier, apparently hindered from slipping off by the very slight projection of the lowest course of stones, which was perpendicular. His brown legs were bare far above the knee, he wore a brown fisherman's coat of a woollen stuff, not woven but fulled like felt; a wide hat of sennet, sewn round and round a small crown of tarred sailcloth, flapped over his ears. He angled in the slow stream with a long reed and a short line. Zoë looked at him attentively as the boat passed near him, and she saw that he was watching her, too, from under the limp brim of his queer hat. Her left hand hung over the gunwale of the skiff, and when she was opposite the fisherman she wetted her fingers and carelessly raised them to her lips as if she were tasting the drops. The man instantly replied by waving his rod over the water thrice, and he cast his short line each time. She had seen his mouth and chin and scanty beard below the hanging brim of his hat, and she had fancied that she recognised him; she had no doubt of it now. The solitary fisherman was Gorlias Pietrogliant, the astrologer. Omobono had scarcely noticed him, for his own natural curiosity made him look steadily up at the high windows, on the chance that the imperial prisoner might look out just then. He had seen him once or twice before the revolution, and wondered whether he was much changed by his long confinement. But instead of the handsome bearded face the secretary remembered, a woman appeared and looked towards Pera for a moment, and drew back hastily as she caught sight of the skiff; she was rather a stout woman with red cheeks, and she wore the Greek head-dress of the upper classes. So much Omobono saw at a glance, though the window was fully ninety feet above him, and she had only remained in sight a few seconds. He had always had good eyes. But without seeing her at all Zoë had understood that communication between the prisoner and the outer world was carried on through Gorlias, and that by him a message could be sent directly to the Emperor. She did not speak till the boat had passed the whole length of the palace and was turning in the direction of the Sweet Waters. 'That astrologer,' she said, 'do you remember him? Why has he never come again?'