The fourth social scale, in the ancient scriptures the term varna, color, is used.
The four varnas are:
Brahmana – Clergy, Intellectuals – the cleric power.
Kshatriya – Regents, Warriors – the mundane power.
Vaishya – Farmers, Merchants.
Shudra – Workers.
In the myths the king and his adviser, a sage, appear. Together they govern the empire.