How do you get Statue of the Four Tetrarchs with the console?

effect create_artifact_statue_four_tetrarchs_effect = { OWNER = root } — runs the scripted effect that makes it, for the character you play (debug mode).

What if the owner can't benefit from Statue of the Four Tetrarchs?

They get Prestige +0.25/month, Court grandeur baseline +5 instead.

Court artifact · Small Wall Ornament

Statue of the Four Tetrarchs

FamedUniqueRoads to Power

Statue of the Four Tetrarchs is a famed small wall ornament artifact in Crusader Kings III: Influence +0.3/month, Level of Influence Impact +5%, Renown +0.5/month, Diplomacy per Level of Influence +1. Quality 70 and wealth 70; maximum durability 100, and it does not wear out. At game start it goes to the holder of Byzantine Empire — needs Roads to Power. It needs Roads to Power. Patch 1.20.0.3, from game/common/scripted_effects/01_exp1_historical_artifacts_creation_effect.txt.

Quick answers (3)

What does Statue of the Four Tetrarchs do in CK3?: Influence +0.3/month, Level of Influence Impact +5%, Renown +0.5/month, Diplomacy per Level of Influence +1 (patch 1.20.0.3).
How do you get Statue of the Four Tetrarchs with the console?: effect create_artifact_statue_four_tetrarchs_effect = { OWNER = root } — runs the scripted effect that makes it, for the character you play (debug mode).
What if the owner can't benefit from Statue of the Four Tetrarchs?: They get Prestige +0.25/month, Court grandeur baseline +5 instead.

An imposing statue of porphyry depicting two members of the first Tetrarchy instituted by Diocletian.

Effects

Influence+0.3/month
Level of Influence Impact+5%
Renown+0.5/month
Diplomacy per Level of Influence+1

For an owner who can't benefit from it

The template gives these instead of the effects above when its “can benefit” check fails:

Prestige+0.25/month
Court grandeur baseline+5

Who can benefit (can_benefit) (6 lines of game script)

OR = {
	is_roman_emperor_trigger = yes
	culture = {
		has_cultural_pillar = heritage_byzantine
	}
}

As written in game/common/artifacts/templates (tree_automa_template).

History and who has it

Made before recorded history.
Kept with the title Byzantine Empire from 940.1.1.
At game start: the holder of Byzantine Empire — needs Roads to Power.

How it is made

The game creates it with the scripted effect create_artifact_statue_four_tetrarchs_effect. In the console (how to open it), this gives it to the character you play:

effect create_artifact_statue_four_tetrarchs_effect = { OWNER = root }

Built from the effect's file; not run in the game by us.

Source: game/common/scripted_effects/01_exp1_historical_artifacts_creation_effect.txt, common/modifiers (statue_four_tetrarchs_modifier), common/artifacts/templates (tree_automa_template) and the English localisation, Crusader Kings III 1.20.0.3.