Rites of so-called same-sex union (Boswell's proposed translation) occur in ancient prayer-books of both the western and eastern churches. They are rites of adelphopoiesis, literally Greek for the making of brothers. Boswell, stated that these should be regarded as sexual unions similar to marriages. Boswell made many detailed translations of these rites in Same-Sex Unions, and stated that one mass gay wedding occurred only a couple of centuries ago in the Archbasilica of St. John Lateran, the cathedral seat of the Pope as Bishop of Rome. This is a highly controversial point of Boswell's text, as other scholars have dissenting views of this interpretation, and believe that they were instead rites of becoming adopted brothers, or blood brothers. Boswell pointed out such evidence as an icon of two saints, Sergius and Bacchus (at St. Catherine's on Mount Sinai), and drawings, such as one he interprets as depicting the wedding feast of Emperor Basil I to his partner, John. Boswell sees Jesus as fulfilling the role of the pronubus or in modern parallel, best man.