Ahilya the beautiful wife of Saga Gautam, according to the historical story in Ramayan Saga Gautam cursed to Ahilya then she becomes stone. According to Ramayana when Shri Ram touched a stone then it turned into a beautiful woman. 

After a long time in the same place, one temple was constructed by King Rudra Sing and King Chhatra Sing in the 16th century. There were two temples were built one for the Ram Janki temple and another dedicated to Saga Gautam and his beautiful wife Ahilya.

Where is the Temple?
The temple is situated in Kamtaul, Darbhanga District in Bihar
Ahilya Asthan located at
Near Kamtaul Railway Station
Darbhanga District, Bihar
India – 847304