Introduction:
The famous book 'Anandmath' was authored by Bankim Chandra Chottapadhyay.

Author:
Bankim Chandra Chottapadhyay, also known as Bankim Chandra Chattopadhyay, was a renowned Indian writer, poet, and journalist. He was born on June 27, 1838, in Naihati, West Bengal, India. Bankim Chandra Chottapadhyay is considered one of the pioneers of modern Bengali literature and played a significant role in the Bengal Renaissance. He is best known for his novel 'Anandmath,' which became a seminal work in Indian literature.

The Book 'Anandmath':
'Anandmath' is a historical novel written by Bankim Chandra Chottapadhyay and was first published in 1882. The novel is set in the backdrop of the Sannyasi Rebellion, an armed uprising against the British East India Company in the late 18th century. The story revolves around a secret Hindu sect called the Sannyasis, who fight against British colonial rule.

Plot:
The novel 'Anandmath' portrays the struggle for independence and the spirit of sacrifice and patriotism. It follows the journey of Mahendra, a young Brahmin from Bengal, who joins the Sannyasi rebels. Mahendra falls in love with Kalyani, a young widow, and their love story unfolds amidst the backdrop of the rebellion.

Key Themes:
1. Nationalism: 'Anandmath' is considered a nationalist novel as it promotes the idea of selfless patriotism and sacrifice for the motherland.
2. Religion and spirituality: The novel explores the role of religion and spirituality in inspiring and motivating individuals to fight for their country's freedom.
3. Freedom and Independence: 'Anandmath' highlights the desire for freedom and independence from colonial rule and the sacrifices made by the characters in their pursuit of these ideals.

Impact:
'Anandmath' had a significant impact on India's freedom struggle and played a crucial role in shaping the nationalistic sentiment during the colonial period. The novel popularized the song "Vande Mataram," which later became the slogan for India's independence movement. It also inspired many freedom fighters and revolutionaries, including Rabindranath Tagore and Sri Aurobindo.

Conclusion:
In conclusion, the famous book 'Anandmath' was authored by Bankim Chandra Chottapadhyay. The novel became a seminal work in Indian literature and played a crucial role in promoting nationalism and inspiring the freedom struggle. It continues to be regarded as a significant contribution to Indian literature and the fight for independence.