Governor-General of India during the Revolt of 1857 was Lord Canning.

Explanation:
The Revolt of 1857, also known as the Indian Rebellion of 1857 or the First War of Independence, was a major uprising against British rule in India. It began in May 1857 and lasted for more than a year. The revolt was a turning point in Indian history and had a profound impact on the subsequent Indian independence movement.

Lord Canning was the Governor-General of India during this period. He served as the Governor-General from 1856 to 1862. Lord Canning played a crucial role in handling the revolt and its aftermath.

Canning's Policies and Actions during the Revolt:
1. Initial Response: When the revolt broke out in May 1857, Canning initially underestimated its scale and significance. He believed it to be a localized mutiny and took some time to comprehend the gravity of the situation.

2. Suppression of the Revolt: As the revolt spread across various parts of India, Canning took several measures to suppress it. He called for reinforcements from Britain and deployed the British army to quell the rebellion. Canning also relied on the support of loyal Indian princes and troops to crush the revolt.

3. Policy of Mercy: While Canning was determined to suppress the revolt, he also adopted a policy of mercy towards the rebels. He believed in punishing the guilty but sparing the lives of those who surrendered. Canning issued a proclamation in July 1857 offering amnesty to rebels who surrendered and laid down their arms.

4. Aftermath and Reforms: After the revolt was crushed, Canning implemented several reforms to address the underlying causes that led to the uprising. He abolished the East India Company and transferred the administration of India to the British Crown. Canning also introduced the Indian Councils Act of 1861, which expanded the role of Indians in the legislative process.

In conclusion, Lord Canning was the Governor-General of India during the Revolt of 1857. He played a significant role in suppressing the revolt and implementing reforms in its aftermath. Canning's policies and actions during this period had a lasting impact on British rule in India.