An artilleryman, named Francisco de Nava, seems to have been maintaining illicit relations with a slave-girl whom he owned, named Maria. That gave rise to troubles, and the artilleryman was placed in the house of brother Guerrero; and finally the slave-girl was taken away from him, and the archbishop, Don Fray Hernando Guerrero, had her sold. The artilleryman was very angry and vexed at that, and his love drew him so powerfully that he said that he wished to marry the slave-girl. She answered that she preferred to be the slave of another than his wife. For that reason, when the slave was very unguardedly following the coach of her mistress on Sunday, August nineteen, one thousand six hundred and thirty-five, that man, with deliberate purpose and overconfident, stealthily approached her in the principal street, near the cemetery of Sant Agustin; and, embracing her from behind, asked her whether she knew him. She answered in the affirmative, and he treacherously stabbed and killed her. He sought refuge in the convent of St. Augustine, where neither the sargento-mayor nor the master-of-camp, who surrounded the convent with soldiers, could find him. At a hazard, they prevented any religious from going out--an abuse contingent on the military, which cannot be checked by a captain-general. Accordingly, the Order of St. Dominic did the governor an injury in their relation, by declaring that he had incurred excommunication on that account, since he had no share in it, but only ordered the soldiers not to allow the treacherous homicide to leave the church. A few days after that, when the matter had cooled down somewhat, an adjutant of the camp, one Don Juan de Frias, because of the reward that was offered, entered the convent at midday, where he found and seized the artilleryman. The cause was referred to the commander of artillery (for the artilleryman was under his command), in order that he might try it in the first instance; and he condemned the artilleryman to death. The latter appealed to his captain-general and the auditor-general of war. The cause was returned, as the appeal was considered out of order, for the captain-general was convinced of the treachery and treason of [the artilleryman]; whereupon the commander of artillery tried to execute the sentence of death.