Context: Investitures, which include the conferring of knighthoods by dubbing with a sword, and other awards take place in the palace's Ballroom, built in 1854. At 36.6 m (120 ft) long, 18 m (59 ft) wide and 13.5 m (44 ft) high, it is the largest room in the palace. It has replaced the throne room in importance and use. During investitures, the Queen stands on the throne dais beneath a giant, domed velvet canopy, known as a shamiana or a baldachin, that was used at the Delhi Durbar in 1911. A military band plays in the musicians' gallery as award recipients approach the Queen and receive their honours, watched by their families and friends.

Question: The Ballroom replaced which other room in terms of importance and use?

Answer: the throne room