All images are my own OR credited to their collection. Other photo credits are as below:
Front page image courtesy of Olly Moss
Oxford University, Bodleian Library, MS Bodley 494, fols 155v-156r. Image courtesy Karl Kinsella
Saint-Sepulce Church, 12th century door, at Marignac, Charente-Maritime, France. Photo courtesy user Jebulon, Wikimedia Commons, under a Creative Commons CC0 1.0 Universal Public Domain Dedication.