As a longtime resident of San Diego County, I found this little bit of trivia amusing.
(after James Michener's account in "Iberia" )
King Felipe II of Spain (1556-1598) had a son whom he named Carlos, after his own father, Carlos V. Carlos the younger was no great scholar, but he was nevertheless enrolled in the very exclusive college founded by Cardinal Cisneros in the city of Alcalá de Henares. One night Carlos crept stealthily out of his dormitory room and headed down the stairs intending to pay a visit to the attractive daughter of the porter. Unfortunately he forgot that the fifth step was broken and tumbled down to the landing, where he hit his head against closed a door. The ardent young prince was found stretched out unconscious, and the matter was immediately reported to the king. Fortunately, young Carlos recovered consciousness, and it looked like he would be fine. But within a few days alarming symptoms appeared, and it was feared that he would die. The most eminent court doctors were summoned, and at least fifty consultations were held. It was likely that a trepanation would be necessary, to relieve the pressure on the brain. Before this could be done a Moorish quack healer from Valencia arrived, bearing two jars of ointment. The Moor claimed that the black ointment had a "strong repercussive action, while the white one attenuates it. Black, white. Black, white. It is the warring if the ointments that saves the life." Word of the prince's dire condition had quickly spread, and soon a crowd of peasants and several Franciscan friars arrived, bearing the cadaver of one of their own, a Franciscan monk named Diego, who had died a century before but whose body had never been contaminated by the grave. The peasants explained that the body of the dead monk had already worked miracles in their community, and they believed it could save Don Carlos.
So three alternatives were open: trepanation, warring ointments, or the cadaver of Fray Diego could be laid alongside the unconscious prince in hopes that it might perform one more miracle.
The doctors left conflicting reports, but it seems that they prepared to do the trepanation by peeling back the scalp in the affected area. However, they decided that the blood oozing through the bone was the right color and a full trepanation was not called for.
The Moor was allowed to apply his ointments, first black, then white. But the medicine was so powerful that the prince grew visibly worse. The Moor had to be hustled out of the city in a hurry.
Finally, the century-old cadaver of Fray Diego was laid in the bed beside Don Carlos, while the Franciscans feverishly prayed. In the morning Carlos awakened, with a clear mind, and reported the he had seen a vision of a Franciscan monk lying beside him. Both Carlos and his father King Felipe believed that the dead monk had saved the prince's life, and they petitioned Rome to have Fray Diego declared a saint. No action was taken through the reigns of three different Pope's, but Felipe persisted. Finally, Pope Sixtus V expedited the investigation and announced the canonization of San Diego in 1588. Years later, to honor his having saved the life of a prince of Spain, a pueblo in the colony of California was named after him.
Unfortunately, Carlos' miraculous recovery did not ensure his future. In the six years that followed, he degenerated into a pathetic cripple with a wandering mind and evil habits (Michener used the word "incubus" to underscore the depth to which Carlos sank). It was even rumored that he considered leaving the Catholic faith to become a Protestant. He either initiated or was drawn into some sort of intrigue against his father, King Felipe, who had him arrested in 1568. Carlos declined rapidly thereafter, and died that July.
Strange that God would grant a miraculous recovery only to allow a horrible degeneration. But then how else would we have a name for America's eighth largest city and California's second largest county?
Nice story, but not true. San Diego, after whom the city and county are named, WAS a Franciscan, who lived and died about a century before young Carlos and the events described. Poor Carlos, who should have been his father’s successor to the throne, was born with a variety of physical and mental ailments due to the extensive inbreeding within the Hapsburg family line, which had been apparent since the days of his grandparents, including Carlos V. He became so unstable that he was confined in 1568 and died shortly thereafter at 23 years of age. There have been lots of speculative and fanciful stories about him for centuries, which Michener drew on for his historical fiction.