The rank of Field Marshal, which means the custodian or keeper of the king’s horses in an old German language, has existed in innumerable countries for at least 830 years or since 1185.field-marshal (or field-marshal, abbreviated as FM) is a very senior military rank, ordinarily senior to the general officer ranks. Usually it is the highest rank in an army, and when it is, few (if any) persons are appointed to it. This rank of five-star general is mostly ceremonial in nature awarded even to civilians LEARN MORE ON