The title has a long history in the Indian subcontinent and Southeast Asia, being attested from the Rigveda, where a rajan- is a ruler,the "battle of ten kings".
Maharaja (also spelled maharajah) is a Sanskrit title for a "great king" or "high king".
The female equivalent title Maharani (or Maharanee, Maharaji) denotes either the wife of a Maharaja or, in states where that was customary, a woman ruling in her own right.
The widow of a Maharaja is known as a Rajamata.
The term Maharaj denotes separate noble and religious offices, although the fact that in Hindi the suffix 'a' in Maharaja is silent makes the two titles near homophones.
Samraat is an Ancient Indian title sometimes translated into modern English as "Emperor".
The title of empress is Samrji. This word has been used as an epithet of various Vedic deities, like Varuna, and has been attested in the Holy Rig Veda.
Typically, in the later Vedic age, a Hindu king (Maharajah) was only called Samrat after performing the Vedic Rajasuya sacrifice, enabling him by religious tradition to claim superiority over the other kings and princes.
Another word for emperor is sarvabhauma. The title of Samrat has been used by many rulers of the Indian subcontinent as claimed by the Hindu mythologies.
In proper history, most historians call Chandragupta Maurya the first samrat of the Indian subcontinent, because of the huge empire he ruled.
Mauran Emperor Ashoka the great is more well-known as Samraat Ashoka because of the vastness of his empire.
In 1556, the Hindu king, Hem Chandra Vikramaditya also called Hemu, established Hindu Raj in north India after defeating Akbar's forces in Agra and Delhi. By virtue of winning 22 battles continuously in the entire North India, from Punjab to Bengal without losing any, Hemu was bestowed the title of "Samrat" and was addressed at the time of Rajbhangsi or coronation at Purana Quila, New Delhi on 7 October 1556 as "Samrat Hem Chander VikramadityaIn Kerala the highest authority on the Namboodiri Brahmins is known as the Azhavanchery Samrat.