"It was mid-December 1610 in Mexico City. The Church was in its preparatory season of Advent, leading up to the celebration of Christ's birth at Christmas. The nuns of the Encarnacion convent had just celebrated the feast of the Immaculate Conception of the Virgin Mary, on 8 December. But now, in this time usually filled with joy, some of the nuns were nervous. Their choirbooks were missing. Without them, the nuns would not be able to celebrate the anniversary of Christ's birth adequately. A musician priest of the metropolitan cathedral, located just three blocks from the convent, had caused the nuns' alarm: Antonio Rodríguez Mata (d. 1643) had all five of the missing books. He had borrowed them from Sister Flor de Santa Clara, the convent "vicaria de coro" (choir vicar) but had failed to return them despite the convent's repeated requests. The diocesan vicar general and the attorney general were summoned. The nuns of the Encarnación demanded that Mata be imprisoned if he failed to return the books immediately following the denunciation. The threat of jail time was serious, but so too was the alleged offense: Mata was impeding the nuns from performing their liturgical music for Christmas"--