Step 1: Understanding the Concept:
Women in the Vedic period were not barred from learning. Several women are named as "rishikas" (women seers), meaning they composed hymns and took part in philosophical debate.
Step 2: Name four such scholars.
1. Gargi Vachaknavi, known for her sharp philosophical questioning of sage Yajnavalkya in the court of King Janaka.
2. Maitreyi, wife of sage Yajnavalkya, remembered for her deep discussion on the nature of the self (atman) in the Brihadaranyaka Upanishad.
3. Lopamudra, wife of sage Agastya, credited with hymns in the Rig Veda.
4. Apala (or Ghosha), a rishika whose hymns also appear in the Rig Veda.
Final Answer:
Gargi Vachaknavi, Maitreyi, Lopamudra, and Apala (or Ghosha) are four well-known female scholars of the Vedic period.