House of Lara
In 1214, on the death of her father, Alfonso VIII of Castile, the crown passed to his only surviving son, Berengaria's 10-year-old brother, Henry I. Their mother Eleanor assumed the regency, but died 24 days after her husband. Berengaria, now heir presumptive again, replaced her as regent. At this point internal strife began, instigated by the nobility, primarily the House of Lara. They forced Berengaria to cede regency and guardianship of her brother to Count Álvaro Núñez de Lara.