Hanuman was 1 of these 4 monkeys. This monkey group was instrumental in offering Rama important information regarding Sita. They assisted him develop a bridge throughout the seas, and cross around that has a monkey army that correctly stormed the demon stronghold and freed Sita. Lord Śiva said to him: https://mantra37159.blogdon.net/5-easy-facts-about-shabar-mantra-described-53634269