 Since Rudolph retained the title of emperor, his succession in the Holy Roman Empire remained uncertain.Matthias, Ferdinand and Maximilian III assembled at Vienna to discuss the issue with Philip III's envoy, Baltasar de Zúñiga, in December.They decided to support Matthias's election as King of the Romans (which could have secured his right to succeed Rudolph II), but the three ecclesiastical electors opposed the plan because of Matthias's concessions to the Protestants in Hungary, Austria and Bohemia.