In Roman Catholic Christianity, the 19th day after Pentecost (June 12th this year) is the Feast of the Sacred Heart. The day is also the Friday of the Octave (eighth day) of Corpus Christi. St. Bernard of Clairvaux, St. Francis of Assisi, St. Bonaventure, and St. Gertrude the Great were pioneers in devotion to Christ's sacred heart, connected to Christ's sacred humanity and, specifically, Christ's wounds. Later, in the 17th century, St. John Eudes helped develop devotion to the sacred hearts of both Jesus and Mary as important for the entire church. Papal approval of the feast day for the whole church dates from 1856.