Article 3, Section 2, Clause 1
Document 73
United States v. Schooner Little Charles
1 Marshall's C.C. 380 C.C.D.Va. 1819The courts of the United States have never doubted their right to proceed under their general powers, as courts of admiralty, where they were not restrained from the use of those powers by statute.
The Founders' Constitution
Volume 4, Article 3, Section 2, Clause 1, Document 73
http://press-pubs.uchicago.edu/founders/documents/a3_2_1s73.html
The University of Chicago Press