Indulgences of the confraternities are ever applicable to the souls in purgatory, and the privileges of the altar for churches and for priests, who are members, may be used in favour of dead members or for all poor souls. The formation of the "Catholic League for Constant Intercession for the Poor Souls in Purgatory" was proposed by certain pious citizens of Rome, approved by Leo XIII in the last years of his reign, and enriched with indulgences. The only requisite for membership is to recite thrice daily the prayer, ""Requiem æternam dona eis Domine et lux perpetua luceat eis. Requiescant in pace. Amen"", thereby gaining once daily an indulgence of 200 days.