Iddo the Seer עדו החוזה

Iddo is an example of how the Tanakh's apparatus of sources works. Chronicles does not tell everything: three times it says "and the rest is written in…" and names names. Among them is Iddo.

On Solomon: the rest of his acts are written in the words of Nathan the prophet, in the prophecy of Ahijah the Shilonite, and in the visions of Iddo the seer concerning Jeroboam son of Nebat. On Rehoboam: in the words of Shemaiah the prophet and Iddo the seer, in the genealogical record. On Abijah: in the commentary of the prophet Iddo.

Those books do not exist, and did not exist in the Talmud's day either. But the references show that behind the biblical narrative stood a whole literature of prophetic records, of which only what entered the canon has reached us.

In the canonical text Iddo appears no further — not one scene, not one line of speech. Zechariah son of Berechiah, one of the Twelve, is called "son of Berechiah, son of Iddo," and tradition identifies that Iddo with this one; there is no firm confirmation, and it is given here as tradition.