"Pope Gregory XII (Latin: Gregorius XII; c. 1326 or 1327 – 18 October 1417), born Angelo Corraro, Corario, or Correr, was the Roman claimant to the headship of the Catholic Church from 30 November 1406 to 4 July 1415. Reigning during the Western Schism, he was opposed by the Avignon pope Benedict XIII and the Pisan popes Alexander V and John XXIII. Gregory XII was forced to abdicate in 1415 to end the Schism." - (en.wikipedia.org 02.01.2021)