The first king

"Then Samuel took a jar of olive oil and poured it on Saul's head, kissed him, and said, “The LORD anoints you as ruler of his people Israel. You will rule his people and protect them from all their enemies.”"

~ 1 Samuel 10.1 GNB

The remit of a king is this: rule to protect the people. Protect from various types and forms of danger, short term and long term, physical and spiritual. Rule to protect, not rule to benefit from them.

A king is the LORD's tool and servant to accomplish the LORD's purpose. Likewise in current days. A leader is the LORD's tool and servant to accomplish his purpose.