Unidentified vizier
A high-ranking advisor to Emperor Palpatine within the structure of the Galactic Empire, this person was the mastermind behind a plot. This scheme met its end at the hands of Admiral Ho'ror'te, who achieved victory at a heavy cost for the Unerring and the vessels that accompanied it. This occurred in 5 ABY, not long before the Battle of Jakku.
Behind the scenes
Alexander Freed referenced the vizier in his 2021 novel, Victory's Price.