The Eastern Orthodox recognize the prophet Amos today. I don't know a lot about Amost, but I remembered Eric Voegelin spent some ink on him, so I grabbed his Israel and Revelation of the shelf. I didn't see a lot about Amos, but I was interested to learn that, after Solomon and the division of Israel, the northern kingdom (the one that fell to Assyria in 721 BC and later housed the loathed Samaritans) had the greater literary output:
As far as the distribution of the literary outburst over Israel and Judah is concerned, the Northern Kingdom seems to have had the greater share. . . . [T]he prophetic revolt of the ninth century occurred in the Northern Kingdom; the Book of the Covenant was a northern production; Hosea was an Israelite prophet; and even the Judaite Amos chose Beth-El in Israel as the place for his short public activity.
I'm not sure if Voegelin wrote much about the later Amos: