jure divino

mid-15c., "one who practices law;" 1620s, "a legal writer, one who professes the science of the law," from Old French juriste (14c.), from Medieval Latin iurista "jurist," from Latin ius (genitive iuris) "a right," especially "legal right or authority, law," also "place where justice is administered, court of justice," from Old Latin ious, perhaps literally "sacred formula," a word peculiar to Latin (not general Italic) that originated in the religious cults, from PIE root *yewes- "law" (compare Latin iurare "to pronounce a ritual formula," Vedic yos "health," Avestan yaoz-da- "make ritually pure," Irish huisse "just"). Related: Juristic. The more mundane Latin law-word lex meant specific laws as opposed to the body of laws.

The Germanic root represented by Old English æ "custom, law," Old High German ewa, German Ehe "marriage," sometimes is associated with this group, or it is traced to PIE *ei- "to go."

late 14c., "pertaining to, of the nature of, or proceeding from God or a god; addressed to God," from Old French divin, devin (12c.), from Latin divinus "of a god," from divus "of or belonging to a god, inspired, prophetic," related to deus "god, deity" (from PIE root *dyeu- "to shine," in derivatives "sky, heaven, god").

Weakened sense of "excellent in the highest degree, heavenly" had evolved by late 15c. The phrase divine right, indicating one conferred by or based on ordinance of God, is from c. 1600.