Question: The "Directa" decretal was written by Pope Siricius in February AD 385, it took the form of a long letter to Spanish bishop Himerius of Tarragona replying to the bishop’s requests for "directa" on various subjects sent several months earlier to which Pope of the Catholic Church from October 366 to his death in 384? 
Sentence (from "Directa Decretal"): It became the first of a series of documents published by the Magisterium that claimed apostolic origin for clerical celibacy and reminded ministers of the altar of the perpetual continence required of them.
Relevant evidence: No