Explanation:

- Option 1: Vishnugupta

- Not known as the 'Napoleon of India.'

- He was the last known ruler of the Gupta dynasty.

- Option 2: Skandagupta

- Famous for defending his empire against the Huns.

- Not referred to as the 'Napoleon of India.'

- Option 3: Samudragupta

- Known as the 'Napoleon of India' due to his extensive military conquests.

- He greatly expanded the Gupta Empire through numerous campaigns.

- Option 4: Chandragupta I

- Known for founding the Gupta dynasty's prominence.

- Not called the 'Napoleon of India.'