Which author penned XXX?
Estoria de España
In 1906, philologist Ramón Menéndez Pidal published the texts of two manuscripts (the second continuing the story of the first, which concludes with the Muslim conquest of Spain) conserved at the library of El Escorial, which he believed to be originals from the time of Alfonso X. He entitled the collection the Primera Crónica General de España - Estoria de España que mandó componer Alfonso el Sabio y se continuaba bajo Sancho IV en 1289 (``First general chronicle of Spain: History of Spain ordered to be composed by Alfonso the wise and continued under Sancho IV in 1289'').