Isabel

Before Javier Olivares joined, the project had little historical accuracy and gave more importance to romance. Gonzalo de Córdoba had an unhistorical sexual relationship with Isabel before her marriage, and the first season ended with her wedding to Fernando in 1469. Olivares pushed for more politics, gave more importance to the character of Isabel's mentor, Gonzalo Chacón, and set the finale in 1474, with Isabel's coronation.

Though set in the late 15th century, ruling monarchs are given the treatment "Majesty" through the series. No monarch, in Spain or elsewhere, received this treatment before 1517, when it was invented by Charles V upon his election as Holy Roman Emperor (Charles had already been treated as "Royal Highness" as King in Spain and though that he deserved something that ranked above that once he was Emperor; other monarchs adopted the treatment for themselves later).