The writer has reserved for this place the various troubles of Solomon’s reign, not allowing them to interrupt his previous narrative. He has, consequently, not followed chronological order. Hadad’s 1 Kings 11:23 and Rezon’s opposition belong to the early years of Solomon’s reign.
Hadad was a royal title (perhaps, the Syriac name for “the Sun”) both in Syria and in Idumaea (compare Genesis 36:35; 1 Chronicles 1:51).