Note:  Do not rely on this information. It is very old.

Dei Gratia

Dei Gratia (Latin by the grace of God), a qualification of their title originally used by bishops and ecclesiastical dignitaries, probably first in the 4th century, afterwards adopted by secular potentates. Ethelbert adopted the title "Dei Gratia Rex Anglorum" in 605 A.D. Charles the Great described himself as "Dei Gratia Rex Regnique Francorum Rector." The first florins coined in England were without the letters "D. G.," but owing to the indignation expressed by the religious world the coinage of them was stopped.