The Sepoy Rebellion was the result of many, many influences and stressors on the cultures of India living under British rule. In Britain, it's called the Sepoy Mutiny on the Indian Mutiny, but in India, it's called the First War of Independence.
The main reason is concerned to the British paramountcy , the Belief in British dominance in India political, economic and cultural life had been introduced in India about 1820.