 The cloister of Notre-Dame occupied the whole area of the island to the north of the cathedral; it was not a cloister in the traditional sense, but a small city enclosed by a wall, where the clerical community of Notre Dame lived and worked.It also included a large garden on the eastern end of the island.In the 11th century, the first school in Paris was established there, teaching young boys reading, writing, arithmetic, the catechism, and singing.