Positioned above the Sadaijin (minister of the left) and the Udaijin (minister of the right), the Daijo-daijin (grand minister of state, also known as Dajo-daijin) was the highest official post in the Daijokan (Grand Council of State) under the Ritsuryo system.
太政大臣（だいじょうだいじん/だじょうだいじん）は律令制において、左大臣・右大臣の上に位置する、太政官における最高位の官職である。