Both privateers and naval vessels belonging to the government made prize of ships and goods belonging to the enemy, but many questions were certain to arise concerning the legality of captures and concerning the proper ownership and disposal of ships and goods. Hence the necessity for prize courts, acting under admiralty law and the law of nations. The instructions to privateers required them (see doc. no. 126, section III.) to bring captured ships or goods into some port of Great Britain or her colonial dominions, for adjudication by such a court. In England, it was the High Court of Admiralty that tried such cases. At the beginning of a war, a commission under the Great Seal,[3] addressed to the Lords of the Admiralty, instructed them to issue a warrant to the judge of that court, authorizing him during the duration of the war to take cognizance of prize causes. After 1689, it was customary to provide for trial of admiralty causes in colonial ports by giving to each colonial governor, in addition to his commission as governor, a commission as vice-admiral. Before 1689, this was done in a few instances, chiefly of proprietary colonies, the earliest such instance being that exhibited in our doc. no. 1; but in the case of colonies having no royal governor (corporation colonies) we find various courts in that earlier period exercising admiralty jurisdiction (docs. no. 8, no. 25, no. 48, and no. 105, note 1). From Queen Anne's reign on (doc. no. 102), jurisdiction in prize causes was conferred, as in the case of the judge of the High Court of Admiralty in London, by warrant (doc. no. 182) from the Lord High Admiral or Lords of the Admiralty pursuant to the commission issued to them, as stated above, at the beginning of the war. In doc. no. 116 we see the judge of the High Court of Admiralty expressing the belief that it would be better if all prizes were brought to his court in London for adjudication, but the inconvenience would have been too great.
[Footnote 3: Such a commission (1748) is printed in R.G. Marsden, _Law and Custom of the Sea_ (Navy Records Society), II. 279, and another (1756) in Stokes, p. 278.]
The governor's commission as vice-admiral, issued (after 1689, at any rate) under the great seal of the High Court of Admiralty, gave him authority to hold an admiralty court in person. Often the governor was not well fitted for such work, though not often so frank as Sir Henry Morgan (doc. no. 46, note 1) in admitting his deficiencies. As admiralty business increased, it became customary to appoint admiralty judges to hold vice-admiralty courts in individual colonies, or in groups of colonies. Sometimes, especially in the earlier period, they were commissioned by the governor of the colony acting under a warrant from the Lords of the Admiralty (doc. no. 69) empowering him so to do; more often they were commissioned directly by those lords, under the great seal of the Admiralty. Doc. no. 180 is a commission of the former sort, doc. no. 181 of the latter. When war broke out, authority to try prize cases was conveyed, as above, to the vice-admiral, the vice-admiralty judge, and their deputies.