The canons of the Lateran were the prime movers in arguing for the supremacy of their basilica. The extant manuscripts in the Lateran archive provide written evidence of the canons’ thoughts and debates, and it is not difficult to imagine one of the canons talking about the site in a way that resembled the Descriptio as presented in the previous chapter. What was the context for their promotion, and who were their addressees?

An important audience of the Descriptio was provided by the many pilgrims and the legates who arrived in Rome from all over Europe. At the beginning of the twelfth century, the Roman papacy claimed universal jurisdiction, regulating dioceses and monasteries throughout Western Christendom. The papal administration evolved as an organization that governed from Iceland in the north to Sicily in the south, from Portugal in the west to Poland in the east. The most important and effective instrument of papal government was the legation. Legates were dispatched from Rome as envoys with the instruction to implement papal decrees. At the same time, a constant flow of European prelates wended their way to Rome. Among these were newly appointed metropolitans and archbishops who were about to receive their pallia at St Peter's and ecclesiastical representatives who wished to bring appeals before the pope. The Pseudo-Isidorean decretals stated that ‘Appeals are to be made to the Roman church by all, but especially by the oppressed. They should flock to her as to their mother, to be nourished by her breasts, defended by her authority and relieved of their oppressions.’ Until Pope Paschal II (1099–1118) began to delegate cases to members of the curia, the pope judged all cases personally. This meant that the petitioners had to wait, often for weeks or months, until they were summoned into the papal presence. Herman of Tournai was one such disgruntled petitioner who described the delay that he experienced in 1142 when he ‘almost starved from boredom in the Lateran palace’ while awaiting the pope's response.