investiture of the Crown Prince
Formal term for the ceremony or act of formally installing a Crown Prince. Used in imperial contexts.
立太子の礼が皇居で執り行われた。
The investiture ceremony of the Crown Prince was held at the Imperial Palace.
Compound of 立 (りつ, 'to establish') and 太子 (たいし, 'Crown Prince'). The reading りったいし reflects a common rendaku-like voicing of たいし to だいし in this compound.