The Drogheda Citadel was a virtually unassailable castle situated on the planet of Drogheda. Functioning as the base of operations for the planet's royal family, its placement on the precipice of a towering mountain meant that the only access was via sky-sled. In the year 4 ABY, the citadel faced an assault from a popular revolutionary movement, who received assistance from Rebel Alliance luminary Lando Calrissian and Danu, the sister of the then-reigning Queen Sarna. Eventually, Sarna was seized and removed from power, with the revolutionaries seizing control of the palace, planning to establish a democratic administration.