1000 – 1100 An eleventh century Byzantine legal treatise makes it clear that gay unions are well-known and legal in early medieval Byzantine society. 1000 – 1100 In Scandinavia, cult transvestitism persisted for centuries. As well, only sons who inherited their fathers' land could marry in early medieval Scandinavia. The others had to leave the land, and they joined warrior societies. Women, expected to remain strictly chaste, and punished severely for violating this rule, were unavailable. Thus, in these warriors clubs, pederasty was practiced as an institutionalized way of life, and a viable alternative to the untouchable women. 1051 St. Peter Damian composed the Book of Gomorrah, in which he luridly described several varieties of gay sex, and said that they were quite common, especially among priests. In this regard he was quite correct; nevertheless, he had no luck convincing his contemporaries that homosexuality was a grave problem that had to be stopped. While Pope Leo IX saw homosexuality as a "grave sin," he was nevertheless reluctant to come down as harshly as Peter Damian wanted him to. 1100 Ivo of Chartes attempts to convince Pope Urban II of the dangers of homosexuality. Ivo charged that Raoul/Ralph, Archbishop of Tours, had the king of France install John as bishop of Orleans. John was well-known as Ralph's lover, and had even had relations with the king himself, which the king openly bragged about. Urban, however, did not see this as a major problem. John ruled effectively as bishop for almost fourty years and Ralph was well-known and well-respected, and continued to be so. 1102 The Council of London took measures to ensure that the public, quite tolerant of homosexuality at the time, knew that it was sinful, marking a significant shift in church attitudes towards homosexuality, which previously had been more or less indifference, or very mild condemnation. Many priests were homosexuals, likely one of the causes of the change in attitude, as moral reformers such as Bernard of Cluny called for change.