सामन्तो बलवतः प्रतिघातोऽन्तर्धिः प्रतिवेशो वा बलवतः पार्ष्णिग्राहो वा स्वयमुपनतः प्रतापोपनतो वा दण्डोपनत इति भृत्यभाविनः सामन्ताः ॥ कZ_०७.१८.२९ब् ॥
sāmanto balavataḥ pratighāto'ntardhiḥ prativeśo vā balavataḥ pārṣṇigrāho vā svayam-upanataḥ pratāpa-upanato vā daṇḍa-upanata iti bhṛtyabhāvinaḥ sāmantāḥ
Subordinate frontier kings (sāmantas) who are inclined to servitude are: for a powerful ruler—(a neighbor who serves as) a counter-check, a buffer/cover (concealment), or an adjacent neighbor; for a powerful ruler also—a rear-enemy (pārṣṇigrāha) who submits; and those who submit of their own accord, submit due to one’s prestige, or submit due to coercive force.
Kautilya distinguishes compliance by consent, prestige, and coercion—each implies different monitoring costs and stability; coercion-based submission is least reliable long-term.