This chapter demonstrates that the lists of amici, viventes et defuncti reflected how the royal monastery was interacting with ruling elites, at different levels, and how such interactions were an essential part of its identity. Competition develops at all levels of society, but for the elite, competing was a matter of predominance and power. Kings had to maintain peace; they had to press their competitors to cooperate, a process for which the authors can use the sociological concept of 'coopetition'. At least as an ideal, competition and cooperation must go hand in hand, on an equal footing, through negotiations and the avoidance or managing of conflicts. Economists insist on the psychological dimension of coopetition in social games. The decision to collaborate with a player with whom one competes depends on trust, and trust is now considered to be the essential factor in determining social order and stability.