You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "In what year was the father of Blanche of Castile born?" whose answer is 1133.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Alfonso VIII, King of Castile birth year
Useful Output:

Doc 1: Alfonso VIII (11 November 11555 October 1214), called the Noble (El  King Alfonso VIII of Castile @ the Peerage. ↑ ALFONSO VIII “el
Doc 2: Alfonso VIII (born 1155—died October 6, 1214, Burgos, Castile [Spain]) was the king of Castile from 1158, son of Sancho III, whom he succeeded
Doc 3: Alfonso VIII (11 November 1155 – 5 October 1214), called the Noble (El Noble) or the one of Las Navas (el de las Navas), was the King of
Doc 4: Born in 1155 - Soria, Castile · Deceased in 1214 - Burgos, Castile (bur. Cistercian monastery, Santa Maria la Real), aged 59 years old · Buried - KING OF CASTILE
Doc 5: King Alfonso VIII of Castile: Government, Family and War brings together a diverse group of scholars whose work concerns the reign of Alfonso