Yolande of Flanders died before October 1219. Theodore sent envoys to Constantinople to announce his claim to succeed her, but the Latin barons ignored it. Theodore proposed new negotiations about the Church union in 1219, taking advantage of the vacancy of the Latin patriarchate of Constantinople. He planned to convoke the Orthodox patriarchs of Constantinople, Antioch, Jerusalem and Alexandria to a synod in Nicaea, but the Orthodox clergy thwarted the idea. Jacopo Tiepolo, the "Podestà" (or head) of the Venetian community in Constantinople, convinced Theodore to spell out the Venetian merchants' privileges in a chrysobull in August 1219. The decree granted the Venetians the right to trade freely in the Empire of Nicaea and exempted them from taxation. The diploma also prohibited each party from copying or counterfeiting coins issued by the other. Theodore attempted to enforce his claim to Constantinople by force in 1220, but the Latins repelled his attack. The new Latin Emperor, Robert of Courtenay, came to Constantinople in March 1221. Peace between the two empires was soon restored.