Which was the important work of Dayananda Saraswati?

The most important work of Dayananda Saraswati was the founding of the Arya Samaj and promotion of the equal rights for women, such as the right to education and reading of Indian scriptures, and his commentary on the Vedas from Vedic Sanskrit in Sanskrit as well as in Hindi.

Dayanad Saraswati wasa sanyasi from boyhood and a scholar. He believed in the infallible authority of the Vedas. Dayananda advocated the doctrine of Karma and Reincarnation. 

He emphasized the Vedic ideals of brahmacharya, including celibacy and devotion to God. For his contribution to Indian society he is widely regarded as one of the ‘Modern Makers of India’.

For further reading check the following articles:

• List of Socio-Religious Movements
• Lucknow Pact
• Indian Education System During British Rule