Out

1. Out of many thousands of gopis, 16,000 are prominent. 
2. Out of these, 108 are important, and 
3. Out of 108, eight are principal. 
4. Out of eight gopis, Radharani and Candravali are chief, and 
5. Out of these two Srimati Radharani is superior.

Source

Skanda Purana