Why Opus Dei and a Spanish bishop are fighting over a Marian shrine

To understand the context of the dispute, it is necessary to go back to 1962.

A public spat between the personal prelature Opus Dei and the Diocese of Barbastro-Monzón, in northern Spain, has just been kicked up a notch, with Bishop Ángel Pérez requesting that Rome make a final decision over who has the right to run the popular pilgrimage site of Our Lady of Torreciudad. 

Credit: Millars via Wikimedia. CC BY-SA 3.0.

Torreciudad in …