Hanuman was a single of these four monkeys. This monkey group was instrumental in supplying Rama vital details about Sita. They served him create a bridge over the seas, and cross about having a monkey army that properly stormed the demon stronghold and freed Sita. Lord Śiva claimed to him: https://tysonuvvts.thekatyblog.com/36084091/indicators-on-matangi-you-should-know