Dominus Litis
A Dictionary of Law · Henry Campbell Black · 1891
A Dictionary of Law
Lat. The master of the suit; ¢. e., the person who was really and directly interested in the suit as a party, as distinguished from his attorney or advocate. But the term is also applied to one who, though not originally a party, has made himself such, by intervention or otherwise, and has assumed entire control and responsibility for one side, and is treated by the court as liable for costs.
See 1 Curt. 201.