Kautilya's Arthashastra 7.3.24

7.3.24

senāpatikumārābhyām upasthātavyam ity ayam /
puruṣāntarasaṃdhiḥ syān nātmanety ātmarakṣaṇaḥ //

Agreement made on the condition that the commander of the army together with the heir-apparent should present himself (when called for), is peace styled purushántarasandhi, ‘peace with hostages other than the king himself’; and it is conducive to self-preservation, as it does not require the personal attendance of the king.