At the time of his death, Felipe II treasured a parchment, parts of which would be rediscovered in El Escorial almost five hundred years later. That writing, analyzed to exhaustion by some Sephardic Jewish scholars, seemed to reveal a magnificent mystery buried in the night of time and that, if completed, would solve the title that sealed it: etemenanki , the master key to understand the common language between the Jews. men and God.