Pope Nicholas IV
Arghun expressed Tengrism's non-dogmatic side. The name "Mongke Tengri" ("Eternal Tengri") is at the top of the sentence in this letter to Pope Nicholas IV, in accordance with Mongolian Tengriist writing rules. The words "Tngri" (Tengri) and "zrlg" (zarlig, decree/order) are still written with vowel-less archaism: