Solomon
Ecclesiastes 10:16ESV·traditional attribution

Woe to you, O land, when your king is a child, and your princes feast in the morning!

Matthew Henry Presbyterian @wholebiblehenry

Solomon here observes, I. How much the happiness of a land depends upon the character of its rulers; it is well or ill with the people according as the princes are good or bad. 1. The people cannot be happy when their princes are childish and voluptuous (Ecc 10:16): Woe unto thee, O land!

Commenting on Ecclesiastes 10:16-20

John Gill Reformed Baptist @doctorgill

Woe to thee, O land, when thy king is a child,.... Not so much in age; though it is sometimes an unhappiness to a nation to be governed by a minor, especially if the young king has not good tutors, guardians, ministers, and counsellors, about him; but, if otherwise, a nation may be very happy under a minority, or the government of a young prince...

Jamieson-Fausset-Brown Reformed @jfbcommentary

a child--given to pleasures; behaves with childish levity. Not in years; for a nation may be happy under a young prince, as Josiah. eat in the morning--the usual time for dispensing justice in the East (Jer 21:12); here, given to feasting (Isa 5:11; Act 2:15).