Calumniæ Jusjurandum
A Dictionary of Law · Henry Campbell Black · 1891
A Dictionary of Law
The oath of calumny. An oath imposed upon the parties to a suit that they did not sue or defend with the intention of calumniating, (ealumniandt animo,) 7. e., with a malicious design, but from a firm belief that they had a guod cause.
Inst. 4, 16.