This is a list of Spanish monarchs—that is, rulers of the country of Spain in the modern sense of the word. The forerunners of the Spanish throne, as well as of the Portuguese throne, were the following:
These lineages were eventually united by the marriage of Ferdinand II of Aragon and Isabella I of Castile. Although their kingdoms continued to be separate, with their personal union they ruled them together as one dominion. Ferdinand also conquered the southern part of Navarre and annexed it to what was to become Spain. Isabella left her kingdom to her daughter Joanna of Castile. Ferdinand served as her regent during her insanity; though rebuffed by the Castilian nobility and replaced by Joanna's husband Philip the Handsome, he resumed his regency after Philip's death. In 1516, after Ferdinand II's death, his daughter Joanna inherited the kingdom of Aragon, but as she was kept prisoner at Tordesillas as insane, and Joanna's son, the future Holy Roman EmperorCharles V did not want to be a regent merely, so he was proclaimed king of Castile and Aragon jointly with his mother in Brussels. Subsequently, Castilian and Aragonese Cortes alleged oath to him as co-king with his mother. Upon her death, he became sole King of Castile and Aragon, and the thrones were thereafter united permanently.
The only monarch from this dynasty was Joseph I, imposed by his brother Napoleon I of France after the kings Charles IV and Ferdinand VII abdicated. The title used by Joseph was King of the Spains and the Indias, by divine grace and the Constitution of the State . He was also later given all of the titles of the previous kings.
The only Monarch of this dynasty was Amadeo I, elected after the Spanish Revolution of 1868 deposed Isabella II. The new title used was King of Spain, by divine grace and will of nation.
Alfonso XIII's claim descended (due to his two eldest sons' renunciations) to his third son, Infante Juan, Count of Barcelona, who was passed over in favour of his eldest son, whose title is King of Spain. The Count of Barcelona renounced his claims in favour of his son in 1977, two years after Franco's death and Juan Carlos's accession.