Lord Hanuman was born, as legend has it, as a boon from Lord Shiv Shankar to Anjana Devi, wife of Kesari, King of a place called Sumeru. Kesari was the son of Brihaspati, and Anjana was an Apsara who was banished from Swarglok due to her disturbing the “tapasya” of a great Rishi. This is why Lord Hanuman is also called “ShivAansh” meaning the energy of Lord Shiva. As the legend goes, he was blessed with immortality and a sect of Hindu’s believe he is still alive.
More about him in my posts.