Ferdinand I of León

Ferdinand I, known as the Great (el Magno), was the count of Castile from 1029 and became the king of León in 1037 after defeating his brother-in-law. He was a younger son of Sancho III of Pamplona and Muniadona of Castile. Ferdinand was also the first to call himself Emperor of Spain in 1056, a title that his heirs continued to use.

His rule marked a shift in power and culture in western Spain. Before Ferdinand, León had been losing importance, but under his leadership and that of his queen, Sancha, the area grew stronger. Ferdinand belonged to the Jiménez dynasty, which took control of western Spain, bringing new energy to the region. His time as ruler helped change the history of Spain.

Date and order of birth

Historians are not sure about Ferdinand’s place among the sons of his father, Sancho III. Ferdinand was definitely a younger son and was probably born after 1011, when his parents married. Most important documents list Sancho’s sons in this order: Ramiro, García, Gonzalo, and then Ferdinand. Some documents from the Cathedral of Pamplona and the monastery of San Juan de la Peña support this order.

Other documents from the monastery of San Salvador de Leire place Ferdinand after Gonzalo. Some of these are from April 17, 1014, which would mean Ferdinand was born before that date. However, these documents have issues with their dates and content. Based on these records, some historians believe Ferdinand was born around 1015 and was the third of Sancho III’s known legitimate sons.

Count of Castile (1029–37)

Ferdinand was just a teenager when García Sánchez, Count of Castile, was killed while entering a church in León. Sancho III of Navarre chose Ferdinand, the son of García’s sister, to be the new count of Castile. Though Sancho was the ruler until his death, Ferdinand was given the title of count and prepared to lead Castile.

Ferdinand married Sancha of León in 1032, and the land between the Cea and Pisuerga rivers became part of Castile. After Sancho died in 1035, Ferdinand kept ruling Castile, but he was still considered a count, not a king. In 1037, Ferdinand defeated and removed the king of León in battle and later became king of León himself.

King of León (1037–65)

Relations with Navarre

On 15 September 1054, Ferdinand defeated his brother García at the Battle of Atapuerca. As a result, Navarre became a smaller state under García’s young son, Sancho García IV. Ferdinand took control of more land from Navarre over the next ten years, but this happened peacefully.

Relations with al-Andalus

War with Zaragoza

In 1060, Ferdinand invaded the taifa of Zaragoza. He captured several forts and moved through many towns. The ruler of Zaragoza was busy fighting others, so he agreed to pay taxes to Ferdinand, which continued until Ferdinand’s death.

War with Toledo

Ferdinand then focused on Yahya ibn Ismail al-Mamun, the ruler of Toledo. In 1058, a bishop from Toledo was appointed in León. In 1062, Ferdinand attacked Toledo’s lands, taking Talamanca and besieging Alcalá de Henares. After seeing his land attacked, al-Mamun agreed to pay taxes to Ferdinand.

Great raid on Badajoz and Seville

In 1063, Ferdinand used the taxes he received to lead a large attack into the lands of Seville and Badajoz. Both areas paid to make him leave. This also helped protect Coimbra, which he planned to attack next.

Reconquests in Portugal

Ferdinand may have attacked Badajoz as early as 1055. In 1057, his army took Lamego. He then moved to take Viseu in 1058 and finally Coimbra in 1064 after a long siege.

War with Valencia

In 1065, Ferdinand’s last campaign was against the taifa of Valencia. He besieged the city but could not capture it. On his way back, he defeated the emir’s troops at the Battle of Paterna. The ruler of Toledo took control of Valencia, and the ruler of Zaragoza again agreed to pay taxes to Ferdinand. Ferdinand fell ill in November and returned home.

Emperor of Spain

Ferdinand was called "emperor" by the scribes of his half-brother, King Ramiro I of Aragon. In old documents from 1036, 1041, and 1061, Ramiro called Ferdinand "emperor in Castile and in León."

The first time Ferdinand used the title "emperor" himself was in 1056. In a document from that year, he is called "the emperor King Ferdinand" while ruling over León, Galicia, and Castile. Only one other document from his time, dated 1058, also uses the title "emperor" for him.

Death and succession

Ferdinand became ill during the Siege of Valencia and the Battle of Paterna, and he passed away on 24 December 1065 in León. He divided his kingdom among his three sons. The eldest son, Sancho, received Castile; the second son, Alfonso, received León; and the youngest son, García, received Galicia. Ferdinand's two daughters, Elvira and Urraca, each received a city: Toro and Zamora respectively.

After Ferdinand's death, Sancho and Alfonso fought against García and later against each other. Sancho eventually reunited their father's territories under his control in 1072, but he was killed that same year, and the territories passed to Alfonso.

Posthumous reputation

See also: Crucifix of Ferdinand and Sancha

After Ferdinand I died, his children began calling him "the great." Over time, he was remembered as a strong and important leader. In later stories, there was a tale about Ferdinand and a demand from leaders of other countries. Though this story is likely not true, it added to his reputation as a great ruler. Historians have different views on whether there might be a small bit of truth in these tales.

Family tree