The Portiuncula (small portion) refers to the land in Assisi, Italy, that belonged to the Benedictines.
On this land was an old church dedicated to the Virgin Mother of God but abandoned.
The great St. Francis had great devotion to the queen of the world and when he saw that the church was deserted, he began to live there constantly and repair it. He heard that the angels often visited it, so that it was called St. Mary of the Angels.