In State Meaning

(idiomatic) with pomp and ceremony.

Example: 1925, Luo Guanzhong, Romance of the Three Kingdoms, translated by Charles Henry Brewitt-Taylor:
  Emperor Ling went in state to the Hall of Virtue. As he drew near the throne, a rushing whirlwind arose in the corner of the hall and, lo! from the roof beams floated down a monstrous black serpent that coiled itself up on the very seat of majesty. The Emperor fell in a swoon.