Speak unto Rehoboam the son of Solomon king of Judah
 He is called king before, but of what tribe or tribes is not expressly said, only it is implied in ( 1 Kings 12:17 ) and he is only acknowledged king of Judah by the Lord himself: 
 and unto all the house of Judah and Benjamin;
 which made but one house, as before but one tribe, ( 1 Kings 11:36 ) 
 and to the remnant of the people;
 of the other tribes that might dwell among them at Jerusalem, and especially Simeon, whose inheritance was within the tribe of Judah, ( Joshua 19:1 ) 
 saying:
 as follows.