Alfonso IV of León

Alfonso IV (c. 890s–933), called the Monk, was a son of Ordoño II of León. After Fruela II died in 925, Alfonso and his brothers, backed by Jimeno Garcés of Pamplona, drove Alfonso Fróilaz into eastern Asturias: Alfonso took León, his brother Sancho took Galicia, and on Sancho's death in 929 he reunited both kingdoms.

In 931 he abdicated in favour of his brother Ramiro II and entered a monastery. A year later, regretting his retirement, he rebelled with Fruela's sons, was captured and blinded, and died at Sahagún in August 933. His son by Onneca Sánchez was Ordoño IV.