Afterwards, Roger, son of Duke Robert Guiscard, begat the second Roger; and this Roger, after the death of his father, was made king of Sicily, and he begat William, and Constance his sister. This William honourably and magnificently ruled the kingdom of Sicily, and he took to wife the daughter of the king of England, and by her he had neither son nor daughter; and when his father Roger was dead, and the sovereignty of the kingdom had passed to William, a prophecy was made known, that Constance, his sister, should rule over the realm of Sicily in destruction and ruin; wherefore King William, having called his friends and wise men, asked counsel of them what he should do with his sister Constance; and it was counselled him by the greater part of them that if he desired the royal sovereignty should be secure, he should cause her to be put to death. But among the others was one named Tancred, duke of Tarentum, which had been nephew to Robert Guiscard through the sister who is thought to have been wife to Bagnamonte [Boemond], prince of Antioch; this man, opposing the counsel of the others, appeased King William, that he should not cause the innocent lady to be put to death; and so it came to pass that the said Constance was preserved from death, and she, not of her own will, but through fear of death, lived in the guise of a nun in a certain convent of nuns. William being dead, the aforesaid Tancred succeeded him in the kingdom, having taken it to himself against the will of the Church of Rome to which pertained the right and property of that kingdom. This Tancred, instructed by natural wit, was very full of learning, and he had a wife more beautiful than the Sibyl, but as many think without breasts, by whom he begat two sons and three daughters: the first was called Roger, which in his father's lifetime was made king, and he died; the second was William the younger, which in his father's lifetime was made king, and after his father was dead he held the kingdom for a time. During these things, Tancred being alive and on the throne, Constance, sister to King William, already perhaps fifty years old, was a nun in her body but not in her mind in the city of Palermo. Discord then having arisen between King Tancred and the archbishop of Palermo, perhaps for this cause, that Tancred was usurping the rights of the Church, the archbishop then thought how he might transfer the kingdom of Sicily to other lordship, and made a secret treaty with the Pope, that Constance should be married to Henry, duke of Suabia, son of the great Frederick; and Henry having taken to wife her to whom the kingdom seemed to pertain by right, was crowned emperor by Pope Celestine. This Henry, when Tancred was dead, entered into the kingdom of Apulia, and punished many of them which had held with Tancred, and had shown him favour, and which had done injury to Queen Constance, and had done shame to the nobility of her honour.