The Confraternity of Belchite was an "experimental" community of knights founded in 1122 by Alfonso the Battler, king of Aragon and Navarre, and lasting until shortly after 1136. Members could enlist permanently or for a set time, vowing "never to live at peace with the pagans but to devote all their days to molesting and fighting them". When the Emperor Alfonso VII confirmed the charter of the confraternity, he specified that it existed "for the defence of Christians and the oppression of Saracens". A Christian organisation dedicated to a holy war against Muslims (reconquista), its impetus and development coincide with that of the international military orders and it introduced the concept of an indulgence proportional to length of service.

Olegarius Bonestruga was the Bishop of Barcelona from 1116 and Archbishop of Tarragona from 1118 until his death. He was an intimate of Ramon Berenguer III, Count of Barcelona, and often accompanied the count on military ventures.