The Letters 124 and 126 in Which St. Bernard of Clairvaux 'Photographed' the 2013 Coup d'État
Here is a concise summary (384 characters): Based on the letters of Saint Bernard defending the rights of Pope Innocent II against the antipope Anaclet (1130), Andrea Cionci draws a parallel with 2013: Benedict XVI not having renounced the Petrine 'munus,' his pontificate remained valid. The election of Francis was therefore canonically null. He was, like Anaclet, and as the antipope Leo is today, his successor, a usurper, for there can be only one pope at a time.