A rare Roman gold coin known as a binio (a double aureus) of the emperor Volusian was found in Somogy, Hungary (see map below). He was the co-ruler with his father Trebonianus Gallus from 251 to 253 AD. They were possibly assassinated by their own troops with the approaching usurper Aemilian.     https://www.archaeology.org/news/10385-220301-hungary-gold-coin   https://www.livescience.com/rare-roman-gold-coin-hungary