Who established the Arya Samaj and what are the principles of Arya Samaj?

Arya Samaj was established by Swami Dayanand on April 7, 1875. The Arya Samaj has 10 principles regarding god and they are as follows:

• God is Formless

• Beginning less
  

• Incomparable

• The Support and Lord of all
  

• Omniscient
  

• Imperishable
  

• Immortal
  

• Fearless
  

• Eternal
  

• Holy  

For further reading check the following articles:

• List of Socio-Religious Movements
• Dayananda Saraswati – Arya Samaj
• Indian Education System During British Rule