Fernando's Rule in León-Castile (1010s)

Timeline

1. 1011–1015León · LeónKing Alfonso V of León pushed the reconquest south of the Duero River and maintained suzerainty over the vassal County of Castile, strengthening the northern Christian frontier amid the fragmentation of the Muslim taifas.
2. 1014–1018Duero River frontier · Castile and LeónAlfonso V and Sancho III of Navarre clashed militarily in La Rioja and along strongholds on the south bank of the Duero, both vying for control of eastern Castilian territory and Muslim frontier fortresses.
3. 1016–1020Castile · CastileFernando, born of the marriage between Sancho III and a daughter of the Count of Castile, was born around this time. After Count Sancho García died in 1017, García Sánchez succeeded him in the County of Castile, and the León-Castile-Navarre triangle grew increasingly complex.