Ordoño III was the King of León from 951 to 956, son and successor of Ramiro II

Ramiro II of León

Ramiro II , son of Ordoño II, was King of León from 931 until his death. Initially titular king only of a lesser part of Asturias, he gained the crown of León after his brother Alfonso IV abdicated in 931...

 (931-951). He confronted Navarre

Navarre

Navarre , officially the Chartered Community of Navarre is an autonomous community in northern Spain, bordering the Basque Country, La Rioja, and Aragon in Spain and Aquitaine in France...

 and Castile

Kingdom of Castile

Kingdom of Castile was one of the medieval kingdoms of the Iberian Peninsula. It emerged as a political autonomous entity in the 9th century. It was called County of Castile and was held in vassalage from the Kingdom of León. Its name comes from the host of castles constructed in the region...

, who supported his half-brother Sancho the Fat

Sancho I of León

Sancho I , called the Fat, was the son of King Ramiro II of León. He succeeded his half-brother Ordoño III in 956 and reigned until his death, except for a two year interruption from 958 to 960, when Ordoño the Wicked usurped the throne...

 in disputing Ordoño's claim to the throne.

He also had to deal with internal rebellion, attacks from the Moors

Moors

The description Moors has referred to several historic and modern populations of the Maghreb region who are predominately of Berber and Arab descent. They came to conquer and rule the Iberian Peninsula for nearly 800 years. At that time they were Muslim, although earlier the people had followed...

 of al-Andalus

Al-Andalus

Al-Andalus was the Arabic name given to a nation and territorial region also commonly referred to as Moorish Iberia. The name describes parts of the Iberian Peninsula and Septimania governed by Muslims , at various times in the period between 711 and 1492, although the territorial boundaries...

, and the rebellion of Galicia. In response to the Muslims, Ordoño III sent troops as far as Lisbon

Lisbon

Lisbon is the capital city and largest city of Portugal with a population of 545,245 within its administrative limits on a land area of . The urban area of Lisbon extends beyond the administrative city limits with a population of 3 million on an area of , making it the 9th most populous urban...

 (955). Before this great show of force, the Muslims had nothing to do but ask for peace. Negotiations ended with a treaty between the king of León and the caliph of Córdoba Abd al-Rahman III (912-961).

He tried to continue the actions of his father in fortifying the land and the royal authority in the face of the contumacious and secessional Fernán González of Castile. He even married Fernán's daughter Urraca

Urraca Fernández

Urraca Fernández , infanta of Castile and daughter of Count Fernán González, was the queen consort of two Kings of León and one King of Navarre between 951 and 994...

 and later repudiated her over her father's alliance with Sancho.

Urraca bore him at least two children: a son named Ordoño who died young and a daughter named Theresa who became a nun. Ordoño III was also father of Bermudo II

Bermudo II of León

Bermudo II , called the Gouty , was the King of Galicia and León . His reign is summed up by Justo Pérez de Urbel's description of him as "el pobre rey atormentado en la vida por la espada de Almanzor y en muerte por la pluma vengadora de un obispo" Bermudo (or Vermudo) II (956–999), called the...

, but opinion is divided as to whether he was son of Urraca, or of a mistress, one of the daughters of Count Pelayo Gonzalez.

Ordoño III died at Zamora in 956.