Like Rome, Avignon remained contested ground throughout the Schism. Secular and religious authorities opposed each other for supremacy, marking the urban landscape through various means. Space became constitutive of and performed authority. As emphasis on the Trastevere, Castel Sant’Angelo, the Lateran, and what I call a Lateranization of the Capitolio, define Roman narratives, St. Didier parish appears distinctively in Avignon’s. In both cities, the areas were remarkably off-centered, away from the traditional location of power. In Avignon, St. Didier was symmetrically opposed to St. Étienne, the papal fortress’ parish. We will see it slowly evolving from the somewhat “polluted” site of capital executions to the meeting ground of the city’s council. In Rome, the Trastevere opposed diagonally the Capitolio, Vaticano, and Laterano.