§ 110.7. =The Council of Constance and Martin V.=--Alexander V. died after a reign of ten months by poison administered, as was supposed, by Balthasar Cossa, resident cardinal legate and absolute military despot, suspected of having been in youth engaged in piracy. Cossa succeeded, as =John XXIII.=, A.D. 1410-1415. He was acknowledged by the new Roman king, =Sigismund=, A.D. 1411-1437, and soon afterwards, in A.D. 1412, by Ladislas [Ladislaus] of Naples, so that Gregory XII. was thus deprived of his last support. The University of Paris continued to demand the holding of a council to effect reforms. Sigismund, supported by the princes, insisted on its being held in a German city. Meanwhile Ladislas [Ladislaus] had quarrelled with the pope, and had overrun the States of the Church and plundered Rome in A.D. 1413, and John was obliged to submit to Sigismund’s demands, He now summoned the =16th œcumenical Council of Constance=, A.D. 1414-1418 (§ 119, 5). It was the most brilliant and the most numerously attended council ever held. More than 18,000 priests and vast numbers of princes, counts, and knights, with an immense following; in all about 100,000 strangers, including thousands of harlots from all countries, and hordes of merchants, artisans, showmen, and players of every sort. Gerson and D’Ailly, the one representing European learning, the other the claims of the Gallican church (§ 118, 4), were the principal advisers of the council. The decision to vote not individually but by nations (Italian, German, French, and English) destroyed the predominance of the Italian prelates, who as John’s creatures were present in great numbers. Terrified by an anonymous accusation, which charged the pope with the most heinous crimes, he declared himself ready to withdraw if the other two popes would also resign, but took advantage of the excitement of a tournament to make his escape disguised as an ostler. Sigismund could with difficulty keep the now popeless council together. John, however, was captured, seventy-two serious charges formulated against him, and on 26th July, A.D. 1415, he was deposed and condemned to imprisonment for life. He was given up to the Count Palatine Louis of Baden, who kept him prisoner in Mannheim, and afterwards in Heidelberg. Meanwhile the leader of an Italian band making use of the name of Martin V. purchased his release with 3,000 ducats. He now submitted himself to that pope, and was appointed by him cardinal-bishop of Tuscoli, and dean of the sacred college, but soon afterwards died in Florence, in A.D. 1419. Gregory XII. also submitted in A.D. 1415, and was made cardinal-bishop of Porto. Benedict, however, retired to Spain and refused to come to terms, but even the Spanish princes withdrew their allegiance from him as pope. The cardinals in conclave elected the crafty Oddo Colonna, who was consecrated as =Martin V.=, A.D.