[The Hospital of Holy Spirit in Saxia of Rome during the XIII century examples for the study of an economic power's development].

The author analyzes the development of the Holy Spirit hospital's economic power during the XIII century through some illustrative examples of original parchment documents, pontifical and private. After the hospital was founded by the pope Innocentius III and gifted of many properties, its charitable activity attracted the admiration and respect of many people, who, with donations and testamentary dispositions, not only around Rome, but also in several Italian regions and outside Italy, contributed to make it ever more powerful in an economic sense.