Naveen Ranganath

Hi All, I was searching on the details or history of sapta kanigal. Our family worships sapta kanigal as our kula devata. My great grandfather has built a temple in my village. The temple is built without any any roof. Its just a small temple with seven idols. I remember my grandmother use to tell stories of kanigal, stating that they are kanya devatas. Do you guys have any detail myth relating to it in any kind of books. Please advise.