Question: Who is the mother-in-law of Maria Of Aragon, Lady Of Cameros?

Knowledge 1: Maria of Aragon, Lady of Cameros
Maria of Aragon (c. 1299–1347 in Sijena) was a daughter of James II of Aragon and his second wife Blanche of Anjou.She married Peter of Castile, Lord of Cameros (1290–1319), son of Sancho IV of Castile.Their daughter, Blanche of Castile (1315–1375), was betrothed to Peter I of Portugal but the marriage never took place.Maria died at Sijena in 1347. [SEP] Knowledge 2: Peter of Castile, Lord of Cameros
Peter of Castile, in Spanish Pedro de Castilla (Valladolid, 1290 – Pinos Puente, 25 June 1319), was an "infante" of Castile, a younger son of King Sancho IV and his wife María de Molina.He held the lordships ("señoríos") of Cameros, Almazán, Berlanga, Monteagudo and Cifuentes and was the "mayordomo" of his brother, King Ferdinand IV of Castile.During the minority of his nephew Alfonso XI, he shared the regency of Castile with his mother and uncle, John "el de Tarifa", between 1313 and his death.Peter married María, a daughter of King James II of Aragon.Their only child, Blanche, was born after Peter's death.Although she was betrothed to King Peter I of Portugal, the marriage never took place.In 1313, reached at divided the regency of the young Alfonso XI between Peter, John and María, with the men being described as "tutores".This was confirmed by a "cortes" at Burgos in 1315.Throughout the disputes over the regency in the years 1312–15 that often devolved into open conflict, Peter supported his mother and was often at odds with his uncle.In 1316, Peter led a military expedition to the frontier of the Kingdom of Granada.According to Christian sources, he won a great victory in the field, but unsuccessfully besieged two castles.Muslims sources mention no victory.In 1317, he again invaded Granada, relieving the siege of Gibraltar and capturing the castle of Bélmez de la Moraleda.In 1319, having received papal approval for a crusade against Granada, Peter and John jointly led an expedition to besiege the fortress of Tíscar.They separated their armies and were ambushed by a Muslim relief force.Both Peter and John were killed in the ensuing rout, known as the Disaster of the Vega de Granada.
Knowledge 1: Peter of Castile, Lord of Cameros
Peter of Castile, in Spanish Pedro de Castilla (Valladolid, 1290 – Pinos Puente, 25 June 1319), was an "infante" of Castile, a younger son of King Sancho IV and his wife María de Molina.He held the lordships ("señoríos") of Cameros, Almazán, Berlanga, Monteagudo and Cifuentes and was the "mayordomo" of his brother, King Ferdinand IV of Castile.During the minority of his nephew Alfonso XI, he shared the regency of Castile with his mother and uncle, John "el de Tarifa", between 1313 and his death.Peter married María, a daughter of King James II of Aragon.Their only child, Blanche, was born after Peter's death.Although she was betrothed to King Peter I of Portugal, the marriage never took place.In 1313, reached at divided the regency of the young Alfonso XI between Peter, John and María, with the men being described as "tutores".This was confirmed by a "cortes" at Burgos in 1315.Throughout the disputes over the regency in the years 1312–15 that often devolved into open conflict, Peter supported his mother and was often at odds with his uncle.In 1316, Peter led a military expedition to the frontier of the Kingdom of Granada.According to Christian sources, he won a great victory in the field, but unsuccessfully besieged two castles.Muslims sources mention no victory.In 1317, he again invaded Granada, relieving the siege of Gibraltar and capturing the castle of Bélmez de la Moraleda.In 1319, having received papal approval for a crusade against Granada, Peter and John jointly led an expedition to besiege the fortress of Tíscar.They separated their armies and were ambushed by a Muslim relief force.Both Peter and John were killed in the ensuing rout, known as the Disaster of the Vega de Granada. [SEP] Knowledge 2: Maria of Aragon, Queen of Castile
Maria of Aragon was the Queen consort of Castile and Leon as the wife of John II of Castile.She was the daughter of Ferdinand I of Aragon and Eleanor of Alburquerque.
Knowledge 1: Maria of Aragon, Lady of Cameros
Maria of Aragon (c. 1299–1347 in Sijena) was a daughter of James II of Aragon and his second wife Blanche of Anjou.She married Peter of Castile, Lord of Cameros (1290–1319), son of Sancho IV of Castile.Their daughter, Blanche of Castile (1315–1375), was betrothed to Peter I of Portugal but the marriage never took place.Maria died at Sijena in 1347. [SEP] Knowledge 2: Maria of Aragon, Queen of Castile
Maria of Aragon was the Queen consort of Castile and Leon as the wife of John II of Castile.She was the daughter of Ferdinand I of Aragon and Eleanor of Alburquerque.

Answer: María de Molina