The Blood of Our Saviour, shed for the redemption of mankind, mentioned repeatedly in the New Testament. Since the Council of Trent theologians generally hold that it was an essential part of the Sacred Humanity and consequently hypostatically united to the Second Person of the Blessed Trinity and therefore an object of adoration. Although special honour was bestowed upon it by the Apostles and Fathers and many saints, yet a feast in its honour was not celebrated till the beginning of the 19th century, when Saint Gaspare del Bufalo obtained permission to have it celebrated in the Missionary Society of the Precious Blood. Pope Blessed Pius IX extended the feast to the entire Church in 1849, assigning it to the first Sunday of July. Pope Pius X changed it to 1 July. To some places a second celebration of the feast has been granted for the Friday after the fourth Sunday of Lent. There has been an arch-confraternity of the Precious Blood since 1815.