Step 1: Understanding the Concept:
While Jainism traditions honor 24 Tirthankaras as historical figures of their respective eras, modern secular historians and archaeologists only acknowledge a few as "historically verifiable" through external evidence, literature, and archaeology.
Step 2: Detailed Explanation:
1. Mahavira (E): Universally accepted as a historical figure, a contemporary of Gautama Buddha (6th Century BC).
2. Parshvanatha (D): Accepted by most historians as a real historical figure who lived approximately 250 years before Mahavira (9th-8th Century BC).
3. Neminath (B): He is the 22nd Tirthankara. Many historians and scholars of mythology consider him historical because he is mentioned in the Hindu Puranas as a cousin of Lord Krishna. While less "archaeologically" proven than the last two, he is frequently categorized with them in scholarly studies of "Historical Tirthankaras."
4. Rishabhanath and Shantinath: Although deeply significant in Jainism, they are placed in prehistoric eras that historians classify as mythological or legendary due to the extreme time gaps and lack of contemporary archaeological evidence.
Step 3: Final Answer:
Historians generally acknowledge Neminath, Parshvanatha, and Mahavira as having a historical or semi-historical basis.