Short answers, pulled from the story.
Pedro de Escobar (c. 1465 - after 1535) was a Portuguese composer, also known as Pedro do Porto, who was one of the earliest and most skilled composers of polyphony in the Iberian Peninsula. He served in the chapel of Isabella I of Castile and later as chapel master at Seville Cathedral, producing sacred music that spread as far as Guatemala.
The Missa pro defunctis is a Requiem setting by Pedro de Escobar and is the earliest known Requiem composed by a musician from the Iberian Peninsula. It is one of only two complete masses by Escobar that have survived.
From 1507, Pedro de Escobar served as maestro de capilla, or chapel master, at the cathedral in Seville. He was responsible for teaching and housing the choirboys, and he eventually resigned, complaining of low pay.
Native scribes in Guatemala copied two of Escobar's manuscripts by hand, demonstrating how widely his music circulated beyond the Iberian Peninsula during and after his lifetime.
The motet Clamabat autem mulier Cananea was singled out for praise by Escobar's contemporaries. It also served as the source for instrumental pieces by later composer Alonso Mudarra.
A document from 1535 records that Escobar was an alcoholic living in squalor. He died in Évora, Portugal, at an unknown date after 1535.