किस प्राचीन भारतीय मौर्य सम्राट को 'देवानांप्रिय' (देवताओं का प्रिय) उपाधि से जाना जाता था?

In Ancient Indian Statecraft, Kautilya's 'Rajamandala' theory primarily deals with:

The First Buddhist Council was held at ______.

Which ancient Indian text contains references indicating that population counts or census-like records were maintained in ancient India?