Question: Who is the sibling-in-law of Favila Of Asturias?

Knowledge 1: Favila of Asturias
Fafila, Favila, or Favilac (died 739) was the second King of Asturias from 737 until his death.He was the only son and successor of Pelagius, the first Asturian monarch, and was named after his paternal grandfather, who was the youngest son of Chindasuinth.In 737 he founded the Church of Santa Cruz, in his capital of Cangas de Onís, but aside from this, nothing else about his reign is known.He was said to have been killed by a bear on a hunt.The hunt was probably a political tool for fostering political ties within his court, a common medieval practice.Nonetheless, later chroniclers of the "Cronica ad Sebastianum" criticised him as given over to excessive levity.Favila was buried with his wife Froiluba in the Church of Santa Cruz de Cangas de Onís.According to the foundation inscription of Santa Cruz, he left children, but they did not succeed him.He was succeeded by his brother-in-law Alfonso, husband of his sister Ermesinda. [SEP] Knowledge 2: Ermesinda
Ermesinda (c. 720 or c. 730 — ?)alternatively Ormisenda, Ermisenda, Ermesinde, Ermessenda) was queen consort of the Kingdom of Asturias, wife of King Alfonso I of Asturias ("Alfonso the Catholic").She was the daughter of King Pelagius of Asturias and his queen, Gaudiosa.
Knowledge 1: Favila of Asturias
Fafila, Favila, or Favilac (died 739) was the second King of Asturias from 737 until his death.He was the only son and successor of Pelagius, the first Asturian monarch, and was named after his paternal grandfather, who was the youngest son of Chindasuinth.In 737 he founded the Church of Santa Cruz, in his capital of Cangas de Onís, but aside from this, nothing else about his reign is known.He was said to have been killed by a bear on a hunt.The hunt was probably a political tool for fostering political ties within his court, a common medieval practice.Nonetheless, later chroniclers of the "Cronica ad Sebastianum" criticised him as given over to excessive levity.Favila was buried with his wife Froiluba in the Church of Santa Cruz de Cangas de Onís.According to the foundation inscription of Santa Cruz, he left children, but they did not succeed him.He was succeeded by his brother-in-law Alfonso, husband of his sister Ermesinda. [SEP] Knowledge 2: Alfonso I of Asturias
Alfonso I of Asturias, called the Catholic(" el Católico"),( c. 693 – 757) was the third King of Asturias, reigning from 739 to his death in 757.His reign saw an extension of the Christian domain of Asturias, reconquering Galicia and León.He succeeded his brother- in- law Favila, and was succeeded by his son, Fruela I. Alfonso's youngest son, Mauregatus, also became king, and his daughter Adosinda was consort to king Silo of Asturias.The dynasty started by Alfonso was known in contemporary Al- Andalus as the" Astur- Leonese dynasty".
Knowledge 1: Favila of Asturias
Fafila, Favila, or Favilac (died 739) was the second King of Asturias from 737 until his death.He was the only son and successor of Pelagius, the first Asturian monarch, and was named after his paternal grandfather, who was the youngest son of Chindasuinth.In 737 he founded the Church of Santa Cruz, in his capital of Cangas de Onís, but aside from this, nothing else about his reign is known.He was said to have been killed by a bear on a hunt.The hunt was probably a political tool for fostering political ties within his court, a common medieval practice.Nonetheless, later chroniclers of the "Cronica ad Sebastianum" criticised him as given over to excessive levity.Favila was buried with his wife Froiluba in the Church of Santa Cruz de Cangas de Onís.According to the foundation inscription of Santa Cruz, he left children, but they did not succeed him.He was succeeded by his brother-in-law Alfonso, husband of his sister Ermesinda. [SEP] Knowledge 2: Romanos Argyros (10th century)
Romanos Argyros was a Byzantine aristocrat and son-in- law of Emperor Romanos I Lekapenos.

Answer: Alfonso I of Asturias