A student and younger contemporary of Domenico Scarlatti on the Iberian peninsula, Portuguese composer Carlos de Seixas (1704-1742) wrote harpsichord sonatas in much the same vein as his teacher. Since precise dates for the compositions of either composer are hard to come by, it is even possible that the student might have influenced the teacher in some ways. His sonatas here don't harness the differentiation of texture to the new possibilities of harmonic rhythm in quite the precise ways that Scarlatti's do, and the multimovement structure of many of the sonatas makes them a little diffuse as compared with Scarlatti's.
The works on this 2-CD set all come from a single source: a document called "Cancionero de Montecassino" which is believed to contain works composed between 1430 and 1480. Somehow the document has survived down through the centuries; it was almost lost when the Abbey where it was stored was bombed in 1944. Luckily the document survived so that this amazing CD set could be recorded by the - also amazing - Le Capella Reial de Catalunya. This CD is the second in a series entitled "Musicas Reales", the first of which being "Carlos V" containing works mainly from the 16th century. If you enjoyed that one, then "Alfons V el Magnanim" will be a welcome addition to your CD spinner.