The fourth Lateran council (twelfth ecumenical), convened by Pope Innocent III.
The fifth Lateran council (eighteenth ecumenical) was convened by Pope Julius II.
A compromise was arranged by Sigismund, who had been crowned emperor at Rome on the 31st of May 1433, by which the pope recalled the bull of dissolution, and, reserving the rights of the Holy See, acknowledged the council as ecumenical (15th of December 1 433).
The council declared that it was canonically convened, ecumenical, and representative of the whole Catholic Church; then proceeded immediately to the trial and deposition of Benedict XIII.
All eyes were consequently turned to the energetic German king, Sigismund, who was inspired by the best motives, and who succeeded in surmounting the formidable obstacles which barred the way to an ecumenical council.