MHDYS was a king of Axum (c.360). He is primarily known through the coins minted during his reign.

Mehadeyis restored Ge'ez

Ge'ez language

Ge'ez is an ancient South Semitic language that developed in the northern region of Ethiopia and southern Eritrea in the Horn of Africa...

 as the language used on all his coins

Aksumite currency

Aksumite currency was the first native currency to be issued in Africa without direct control by an outside culture like the Romans or Greeks. It was issued and circulated from the middle of the height of the Kingdom of Aksum under King Endubis around AD 270 until it began its decline in the first...

. Munro-Hay notes that the legend upon his bronze coins, "bzmsql tmw" "by this cross you will conquer" was a loose translation of the famous motto of Emperor Constantine the Great, In hoc signo vinces ("By this sign you will conquer.")