Hanuman was a person of these 4 monkeys. This monkey group was instrumental in providing Rama key information regarding Sita. They served him build a bridge through the seas, and cross over using a monkey army that properly stormed the demon stronghold and freed Sita. भस्मसादभवदैत्यो दुष्टचेष्टितमन्तकृत् ॥ २३ ॥ https://danteeubfi.blogdiloz.com/36334384/a-review-of-mohini