Invented it? Some unknown person from pre-history, probably a Greek. The earliest history of Greece has politicians who are skilled at oratory. Earlier civilizations such as the Babylonians and Egyptians were more monarchial, and oratory would not have been a prized skill among them.
The Oratory School was created in 1859.
Oxford Oratory was created in 1993.
Brompton Oratory was created in 1884.
The Oratory Preparatory School was created in 1859.
London Oratory School was created in 1852.
Oratory of Santissimo Crocifisso was created in 1568.
Oratory Preparatory School was created in 1907.
An oratory speech is 8-10 min. persuasive speech.
The motto of Oratory Preparatory School is 'Fidelitas'.
The Congregation of Holy Cross is in charge of the Oratory in Montreal.
Oratory (the art of manliness)
Oratory Athenaeum for University Preparation was created in 1998.