But the Circuit Court as a court of equity certainly had equity jurisdiction over its own judgment as a court of law, without regard to the character of the parties; and had not only the right, but it was its duty--no matter who were the parties in the judgment--to prevent them from proceeding to enforce it by execution, if the court was satisfied that the money was not justly and equitably due. The ability of Darnall to convey did not depend upon his citizenship, but upon his title to freedom. And if he was free, he could hold and convey property, by the laws of Maryland, although he was not a citizen. But if he was by law still a slave, he could not. It was therefore the duty of the court, sitting as a court of equity in the latter case, to prevent him from using its process, as a court of common law, to compel the payment of the purchase-money, when it was evident that the purchaser must lose the land. But if he was free, and could make a title, it was equally the duty of the court not to suffer Legrand to keep the land, and refuse the payment of the money, upon the ground that Darnall was incapable of suing or being sued as a citizen in a court of the United States. The character or citizenship of the parties had no connection with the question of jurisdiction, and the matter in dispute had no relation to the citizenship of Darnall. Nor is such a question alluded to in the opinion of the court. Besides, we are by no means prepared to say that there are not many cases, civil as well as criminal, in which a Circuit Court of the United States may exercise jurisdiction, although one of the African race is a party; that broad question is not before the court. The question with which we are now dealing is, whether a person of the African race can be a citizen of the United States, and become thereby entitled to a special privilege, by virtue of his title to that character, and which, under the Constitution, no one but a citizen can claim. It is manifest that the case of Legrand and Darnall has no bearing on that question, and can have no application to the case now before the court.