Write an article that answers the following question: Who became the Grand Master that commanded negotiations with Poland in May 1414, Küchmeister or von Plauen ?
After the Polish-Lithuanian-Teutonic War of 1410-1411 not all issues between the Grand Duchy of Lithuania and Teutonic Knights were settled. The most contentious matter was the border between Samogitia and Prussia. Grand Duke of Lithuania Vytautas the Great demanded the entire right bank of the Neman River including the town of Memel . The Knights demanded that after deaths of Vytautas and Jogaila, King of Poland, Samogitia would pass to them. Sigismund, Holy Roman Emperor, agreed to mediate the dispute and appointed Benedict Makrai to hear the arguments. On 3 May 1413, Benedict made the decision and recognized the right bank of the Neman River, including Klaipėda, to Lithuania. The Knights refused to accept this decision and Teutonic Grand Master Heinrich von Plauen ordered Teutonic armies into northern Poland. The army, commanded by Michael Küchmeister von Sternberg, returned into Prussia after just 16 days of campaign. The knights did not believe that the Order, still recovering from the defeat in the Battle of Grunwald in 1410, was ready for another war with Poland. Küchmeister deposed von Plauen and became the Grand Master. He attempted to reopen the negotiations with Poland in May 1414. As King Jogaila demanded to reinstate von Plauen and refused any attempts at a compromise, the talks broke down.