Fame trait
Former Emperor
add_trait former_emperorremove_trait former_emperorTrait ID former_emperor. Console commands work with the debug mode on (launch option -debug_mode, then the ` key) and act on the character you play.
This character was once the Ceremonial Monarch and retains considerable influence despite having left the throne.
Source: game/common/traits/00_traits.txt and the English localisation, Crusader Kings III 1.20.0.3.