Ratan Singh was the ruling Maharaja of the

princely state A princely state (also called native state or Indian state) was a nominally sovereign entity of the British Raj, British Indian Empire that was not directly governed by the British, but rather by an Indian ruler under a form of indirect rule, ...

of Bharatpur from 1768 to 1769. He ascended the throne after the death of Maharaja Jawahar Singh. Jawahar Singh had no son, hence he was succeeded by his brother, Ratan Singh. During a Holi festival held in Vrindavan, possibly drunk Ratan Singh was killed by a dwarf in Bharatpur a very dilapidated "Ratan Chhatri" is still present. His son Maharaja Kehri Singh succeeded him in 1769.

References

---- Jat rulers Rulers of Bharatpur state 1769 deaths Year of birth unknown Jat {{India-royal-stub