Tradition says that in 1458, the Virgin Mary appeared to two shepherds from the Cirosa farmhouse in the form of a young girl while they were grazing their flock in the Pla de la Bassadòria, in the municipality of Riner, Solson. In this apparition, the Virgin Mary asked that processions and penance be performed to end the plague that was afflicting the area. The Bishop of Urgell, Arnau Roger de Pallars, quickly authorized the construction of a chapel. Many parishioners attended, the chapel became too small, and in the mid-16th century, a second church was built. At the same time, a hostel was built to accommodate pilgrims and sick travelers, which was gradually expanded until it became the current Casa Gran (Great House).