Caliph Al-Qa'im of the Abbasid dynasty still holds onto Baghdad and some power, but is a vassal of the Seljuk Empire, and is even married to the Emperor's sister.

Source: https://gamerant.com/crusader-kings-3-dlc-best-starting-rulers-legacy-of-persia/

Clan Saxon remained in power, doing the Emperor's bidding, for nearly 20 years.

Source: https://comicbook.com/starwars/news/mandalorian-star-wars-bo-katan-clone-wars-mandalore-history/

Initially the Emperor's Hand, Mara ultimately became Luke Skywalker's wife in Legends.

Source: https://screenrant.com/star-wars-best-legends-jedi-shines-in-stunning-cosplay/