It can scarcely be necessary to pursue such a question further. The want of jurisdiction in the court below may appear on the record without any plea in abatement. This is familiarly the case where a court of chancery has exercised jurisdiction in a case where the plaintiff had a plain and adequate remedy at law, and it so appears by the transcript when brought here by appeal. So also where it appears that a court of admiralty has exercised jurisdiction in a case belonging exclusively to a court of common law. In these cases there is no plea in abatement. And for the same reason, and upon the same principles, where the defect of jurisdiction is patent on the record, this court is bound to reverse the judgment, although the defendant has not pleaded in abatement to the jurisdiction of the inferior court. The cases of Jackson _v._ Ashton and of Capron _v._ Van Noorden, to which we have referred in a previous part of this opinion, are directly in point. In the last-mentioned case, Capron brought an action against Van Noorden in a Circuit Court of the United States, without showing, by the usual averments of citizenship, that the court had jurisdiction. There was no plea in abatement put in, and the parties went to trial upon the merits. The court gave judgment in favor of the defendant with costs. The plaintiff thereupon brought his writ of error, and this court reversed the judgment given in favor of the defendant, and remanded the case with directions to dismiss it, because it did not appear by the transcript that the Circuit Court had jurisdiction. The case before us still more strongly imposes upon this court the duty of examining whether the court below has not committed an error, in taking jurisdiction and giving a judgment for costs in favor of the defendant; for in Capron _v._ Van Noorden the judgment was reversed, because it did _not appear_ that the parties were citizens of different States. They might or might not be. But in this case it _does appear_ that the plaintiff was born a slave; and if the facts upon which he relies have not made him free, then it appears affirmatively on the record that he is not a citizen, and consequently his suit against Sandford was not a suit between citizens of different States, and the court had no authority to pass any judgment between the parties. The suit ought, in this view of it, to have been dismissed by the Circuit Court, and its judgment in favor of Sandford is erroneous, and must be reversed. It is true that the result either way, by dismissal or by a judgment for the defendant, makes very little, if any, difference in a pecuniary or personal point of view to either party. But the fact that the result would be very nearly the same to the parties in either form of judgment would not justify this court in sanctioning an error in the judgment which is patent on the record, and which, if sanctioned, might be drawn into precedent, and lead to serious mischief and injustice in some future suit.