Lat By the grace of God. A phrase used in the formal title of a “king or queen, importing a claim of sover-eignty by the favor or commission of God. In ancient times it was incorporated in the titles of inferior officers, (especlally ecclesias-tlcal.) bnt in later use was reserved as an as-eertlon of “the dlvlne right of kings
Source: Black’s Law Dictionary 2nd Ed (1910)
