|←Author Index: Gr||Pope Gregory XV
|Born Alessandro Ludovisi, was pope from 1621 to 1623.|
- Omnipotentis Dei, 20 March, 1623
- Aeterni Patris, 15 November, 1621
Works about Pope Gregory XV
- "Gregory XV." in the Encyclopædia Britannica, 9th ed.
- "Gregory XV." in the Encyclopædia Britannica, 11th ed.
Works by this author published before January 1, 1923 are in the public domain worldwide because the author died at least 100 years ago. Translations or editions published later may be copyrighted. Posthumous works may be copyrighted based on how long they have been published in certain countries and areas.