Prachin Hanuman Mandir is an ancient temple dedicated to Bal Hanuman from the Mahabharata period. It is claimed to be one of the five temples of Mahabharata days in Delhi.
Reportedly, it was built originally by Maharaja Man Singh I of Amber(1540–1614) during Emperor Akbar’s (1542-1605) reign. It was reconstructed by Maharaja Jai Singh(1688-1743) in 1724, around the same time as the Jantar Mantar. After that, the temple has undergone many improvements making it a notable religious centre in the heart of Central Delhi.
It is believed that Tulsidas (1532–1623), who wrote Ramacharitamanas (popularly known as Tulsi Ramayan and penned the famous Hanuman Chalisa hymns in praise of Hanuman, visited this temple in Delhi. During his visit to Delhi, Tulsidas was summoned by the Mughal Emperor and asked to perform a miracle, which he did with the blessings of Lord Hanuman. The Emperor was pleased with Tulsidas and presented the Hanuman temple with an Islamic crescent Moon finial which adorns the temple spire. It is also claimed that because of the crescent moon symbol on the spire, the temple was not destroyed by the Muslim rulers who invaded India at various times.
An important feature of the worship at this temple is the 24–hour chanting of the mantra (hymn) “Sri Ram, Jai Ram, Jai Jai Ram”, since August 1, 1964. It is claimed that this continuous chanting has been recorded in the Guinness Book of World Records.