Under the ritsuryo system (a system of centralized government based on the ritsuryo code), a ceremony in which Iki (a letter of appointment) is awarded for Ikai, and a notification of a governmental post by senji (imperial decree) and its incidental ceremony are implemented at the time of appointment.
律令制においては補任の際には位階は位記授与、官職は宣旨による告示とそれに付随する儀式が行われる。