How do you get Monomachus Crown with the console?

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

Personal artifact · Headgear

Monomachus Crown

FamedUniqueThe Royal Court

Monomachus Crown is a famed headgear artifact in Crusader Kings III: Prestige +0.25/month, Martial per Stress Level +1, Intrigue per Stress Level +1. Quality 70 and wealth 70; maximum durability 100, and it does not wear out. Made on 1042.6.11 for Konstantinos Monomachos in Constantinople. At game start it goes to the holder of Byzantine Empire (starts from 1000.1.1) — needs The Royal Court. It needs The Royal Court. Patch 1.20.0.3, from game/common/scripted_effects/01_exp1_historical_artifacts_creation_effect.txt.

Quick answers (2)

What does Monomachus Crown do in CK3?: Prestige +0.25/month, Martial per Stress Level +1, Intrigue per Stress Level +1 (patch 1.20.0.3).
How do you get Monomachus Crown with the console?: effect create_artifact_monomachus_crown_effect = { OWNER = root } — runs the scripted effect that makes it, for the character you play (debug mode).

This is a crown comprised of golden paneled portraits depicting Constantine IX Monomachus, his wife Zoe, sister Theodora, and some allegorical dancing figures.

Effects

Prestige+0.25/month
Martial per Stress Level+1
Intrigue per Stress Level+1

Who can equip it (can_equip) (14 lines of game script)

trigger_if = {
	limit = {
		has_ach_dlc_trigger = yes
		coronation_proper_artifact_crown_trigger = yes
		NOT = {
			scope:artifact = {
				category = court
			}
		}
	}
	NOT = {
		has_realm_law = uncrowned
	}
}

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

History and who has it

Made on 1042.6.11 for Konstantinos Monomachos in Constantinople.
Kept with the title Byzantine Empire from 1055.1.11.
At game start: the holder of Byzantine Empire (starts from 1000.1.1) — needs The Royal Court.

How it is made

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

effect create_artifact_monomachus_crown_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 (monomachus_crown_modifier), common/artifacts/templates (unique_crown_wearable_template) and the English localisation, Crusader Kings III 1.20.0.3.