Kautilya's Arthashastra 5.6.8

5.6.8

yaś ca mukhyaḥ pakṣavān durgāṭavīstho vā vaiguṇyaṃ bhajeta tam upagrāhayet //

Cognates, princes, and other chiefs of the royal family may be employed in works such as the capture of a chief who, employed as a commander of a fort or the tracts of wilderness, has turned inimical along with a strong band of supporters; or they may be sent on an expedition full of difficulties, or to visit the family of the king's friend.