I Made This

Needs Royal Court, and comes in two parts: loot an artifact you hold no claim on, then have your heir inherit it. The tidy setup is to gift one of your starting artifacts to a weak neighbour, declare an easy war, and take it back in the peace deal - the wiki-endorsed route for a claim-free loot. Then it's a waiting game: keep the artifact, grow old gracefully, and this pops on succession when your heir picks it up. Works nicely alongside Patronage.