ar·ti·fact also ar·te·fact (ärt-fkt)
1. An object produced or shaped by human craft, especially a tool, weapon, or ornament of archaeological or historical interest.
2. Something viewed as a product of human conception or agency rather than an inherent element: "The very act of looking at a naked model was an artifact of male supremacy" (Philip Weiss).
In this context it may well mean papers.
Church indulgences beats me, a bit.
The Roman Catholic church, in historical times (see causes of reformation) made money by selling Indulgences, which were little bits of paper promising time off from one's time in Purgatory for oneself, or loved ones who had die4d.
This practice was roundly condemned as fraudulent and wicked by critics such as Martin Luther.
I have never heard of such a practice in the Church of England, of which George III as king was the head.
I can only imagine Church leaders told him he was a great fella, and god would forgive him, and such, in order to earn favours from him?