There's Still Time...

I think we could still get this organized by next January 20:

At his investiture ceremony, the kaghan was first wrapped in a felt rug and spun nine times, then mounted on a horse and made to ride, and then nearly strangled with a silk shawl. When he had almost lost consciousness, he would be asked to state how many years he would rule.

So Carter Vaughn Findley in The Turks in World History, discussing the second Türk kaghanate in central Asia (682-745). Findley adds:

The Arab geographer al-Istakhri, describing the survival of the ritual of the Turk successor state of the Khazars, reported that a kaghan would be killed when the number of years he stated had ended.

— Carter Vaughn Findley, The Turks in World History 41-2 (2005)