Carlos I of Spain and V of the Holy Roman Germanic Empire, called "El César", son of Juana I of Castile and Felipe I el Hermoso, and paternal grandson of Maximilian I of Habsburg and María de Borgoña and maternal grandson of the Reyes Católicos, is elected emperor of the Holy Roman Empire on the death of his grandfather Maximilian, in the year 1519.
He reigned together with his mother—the latter only nominally—in all the kingdoms and territories of Spain under the name of Carlos I from 1516 to 1556, thus uniting for the first time in the same person the Crowns of Castile —the Kingdom of Navarre and Aragon.
Carlos I of Spain and V of Germany was known in his time as "THE Emperor" since no king ever managed to unite such an immense empire under his command.
In his person he brings together the territories from the quadruple inheritance of his grandparents: Habsburg (Maximilian I), Burgundian (María de Borgoña), Aragonese (Fernando el Católico) and Castilian (Isabel la Católica).
After so many wars and conflicts, Carlos V entered a phase of reflection: about himself, about life and his experiences, and also about the state of Europe.
Carlos V began to be aware that Europe was heading to be governed by new princes, who, in the name of maintaining the States themselves, did not attempt to alter the political-religious balance within each of them in the slightest. His conception of the Empire had passed and Spain was consolidated as a hegemonic power.
He retired to the Monastery of Yuste where he remained in retirement for a year and a half, away from the cities and political life, and accompanied by the order of the Jerónimos who spiritually guided the monarch until his last days. On September 21, 1558, he died of malaria. The coffin of Carlos I is located in the Royal Crypt of the Monastery of El Escorial known as the Pantheon of the Kings.