The princes. The term will include the members of the various branches of the royal family, who acted as judges (see on Jeremiah 21:12), and the "elders," or heads of families (see Jeremiah 26:17). Without the presence of the former, Jeremiah could only have had a mock-trial.
Came up, etc. (see on Jeremiah 22:1). Of the Lord's house; better simply, of the Lord. The gate is the same which is referred at Jeremiah 20:2.