Solomon
Proverbs 19:12ESV·traditional attribution

A king’s wrath is like the growling of a lion, but his favor is like dew on the grass.

Matthew Henry Presbyterian @wholebiblehenry

This is to the same purport with what we had Pro 16:14, Pro 16:15, and the design of it is, 1. To make kings wise and considerate in dispensing their frowns and smiles. They are not like those of common persons; their frowns are very terrible and their smiles very comfortable, and therefore it concerns them to be very careful that they never frighten a...

John Gill Reformed Baptist @doctorgill

The king's wrath is as the roaring of a lion,.... Which is very terrible when hungry, and is after its prey, and has got it. Kings, especially tyrannical ones, are compared to lions; as Nebuchadnezzar by Jeremiah, Jer 4:17; and Nero by the Apostle Paul, Ti2 4:7; and the rage of such is very dreadful, as Ahasuerus's was to Haman. Jarchi interprets the king, of the holy blessed God.

Jamieson-Fausset-Brown Reformed @jfbcommentary

(Compare Pro 16:14-15; Pro 20:2). A motive to submission to lawful authority.