De Jure
A Dictionary of Law · Henry Campbell Black · 1891
A Dictionary of Law
Of right; legitimate; lawful; by right and just title. In this sense it is the contrary of de facto, (which see.) It may also be contrasted with de gratia, in which case it means "as a matter of right," as de gratia means "by grace or favor." Again it may be contrasted with de aequitate; here meaning "by law," as the latter means "by equity." See Government. De jure decimarum, originem ducens de jure patronatus, tunc cognitio spectat ad legem civilem, i. e., communem.
Godb. 63.
With regard to the right of tithes, deducing its origin from the right of the patron, then the cognizance of them belongs to the civil law; that is, the common law.