At the fifteenth session, 5 June 1409, the Council of Pisa attempted to depose both Pope and antipope as schismatical, heretical, perjured and scandalous, but it then added to the problem by electing a second antipope, Alexander V. He reigned briefly from June 26, 1409, to his death in 1410, when he was succeeded by antipope John XXIII, who won some but not universal support.