Now when Ebedmelech the Ethiopian, one of the eunuchs which was in the king's house, heard that they had put Jeremiah in the dungeon; the king then sitting in the gate of Benjamin; Ebed-melech - The servant of the king one of the eunuchs who belonged to the palace. Perhaps it should be read, "Now, a servant of the king, a Cushite, one of the eunuchs," etc.
The king then sitting in the gate of Benjamin - To give audience, and to administer justice. We have often seen that the gates of cities were the places of public judicature.