High Quality Content by WIKIPEDIA articles! Liber Regulae Pastoralis or Regula Pastoralis (The Book of the Pastoral Rule, commonly known in English as "Pastoral Care", a translation of the alternative Latin title Cura Pastoralis) is a treatise on the responsibilities of the clergy written by Pope Gregory I around the year 590, shortly after his papal inauguration. It became one of the most influential works on the topic ever written. The title was that used by Gregory when sending a copy to his friend Leander of Seville. The text was addressed to John, the Exarch of Ravenna, as a response to a query from him. Gregory later revised the text somewhat.