Ordoño II of León in the context of "Fruela II of León"

The Kingdom of León was an independent kingdom situated in the northwest region of the Iberian Peninsula. It was founded in 910 when the Christian princes of Asturias along the northern coast of the peninsula shifted their capital from Oviedo to the city of León. The kings of León fought civil wars, wars against neighbouring kingdoms and campaigns by both the Moors and the Vikings, all in order to protect their kingdom's changing fortunes.

García is the first of the kings described by the charters as reigning in León. It is generally assumed that the old Asturian kingdom was divided among the three sons of Alfonso III of Asturias: García (León), Ordoño (Galicia) and Fruela (Asturias), as all three participated in deposing their father. When García died in 914, León went to Ordoño, who now ruled both León and Galicia as Ordoño II. At Ordoño's death in 924, the throne went to his brother Fruela II (924–925), who died of leprosy a year later. Fruela's death in 925 was followed by a civil war, after which Alfonso, the eldest son of Ordoño II, emerged as the new king Alfonso IV, ruling from 925 to 932. After a further power struggle, Ramiro, the younger brother of Alfonso IV, became king in 932, having captured his brother Alfonso, as well as the three sons of Fruela II – Alfonso, Ordoño and Ramiro. Alfonso IV may have died soon after, but he left two infant sons, called Ordoño and Fruela. When Ramiro died in 951, he left two sons by two different wives. When the elder son Ordoño III, who ruled from 951 to 956, suddenly died aged little more than thirty, he was succeeded by his younger half-brother Sancho I "The Fat" (956–966), as Ordoño had failed to produce a legitimate heir.

Alfonso III (c. 848 – 20 December 910), called the Great (Spanish: el Magno), was king of Asturias from 866 until his death. He was the son and successor of Ordoño I. After his death, the Kingdom of Asturias was split between his sons, with García inheriting León, Ordoño inheriting Galicia, and Fruela inheriting Asturias.

In later sources, he is the earliest to be called "Emperor of Spain." He was also titled "Prince of all Galicia" (Princeps totius Galletiae).

García I (c. 871 – 914) was the King of León from 910 until his death and eldest of three succeeding sons of Alfonso III of Asturias by his wife Jimena.

García took part in the government alongside his father until 909. In that year a conspiracy, in which García was implicated, was uncovered. Alfonso renounced the throne and divided the realm among his three sons. León went to García, Galicia to Ordoño, and Asturias to Fruela. Asturian primacy was nevertheless recognised.

Fruela II (c. 874–August 925) was the king of Asturias from 910 to 924 and king of León from 924 to 925. His father was Alfonso III of Asturias and his mother was Jimena. In 910 Fruela and two of his brothers deposed their father, Alfonso, and divided the kingdom amongst themselves. Fruela, the youngest brother, took the original portion (Asturias); Ordoño took Galicia; and García, the eldest, took León. Although Fruela called himself king of a much-diminished Asturias, evidence suggests that his role was subordinate to the king of León.

Alfonso IV (c. 890s – 933), called the Monk (Spanish: el Monje), was King of León from 925 (or 926) and King of Galicia from 929, until he abdicated in 931.

When Ordoño II died in 924 it was not one of his sons who ascended to the throne of León but rather his brother Fruela II of Asturias. The exact circumstances of the succession upon Fruela's death one year later are unclear, but the son of Fruela, Alfonso Fróilaz, became king in at least part of the kingdom when his father died. Sancho Ordóñez, Alfonso, and Ramiro, the sons of Ordoño II, claimed to be the rightful heirs and rebelled against their cousin. With the support of king Jimeno Garcés of Pamplona, they drove Alfonso Fróilaz to the eastern marches of Asturias, and divided the kingdom among themselves with Alfonso Ordóñez receiving the crown of León and his elder brother Sancho being acclaimed king in Galicia.

Ramiro II (c. 900 – 1 January 951), son of Ordoño II and Elvira Menendez, was a King of León from 931 until his death. Initially titular king only of a lesser part of the kingdom, he gained the crown of León (and with it, Galicia) after supplanting his brother Alfonso IV and cousin Alfonso Fróilaz in 931. The scant Anales castellanos primeros are a primary source for his reign.

He actively campaigned against the Moors, who referred to him as the Devil due to his ferocity and fervor in battle. He defeated the hosts of the Umayyad caliph, Abd al-Rahman III, at the Battle of Simancas (939).