in Ecc.9:14-16

14 There was once a small city with only a few people in it. And a powerful king came against it, surrounded it and built huge siegeworks against it. 15 Now there lived in that city a man poor but wise, and he saved the city by his wisdom. But nobody remembered that poor man.

why was this man forgotten ? because he was poor ? because he didn't mention what he did and didn't think it was a big deal ? this just jumped at me .

do You have any ideas?