Ranjit Dev was an important ruler of Deva dynasty of Jammu.
Jammu State was situated between Chenab and Ravi rivers.
During his time Jammu was sacked by Sikhs of Bhangi Misl and became its tributary.
During his time Battle of Jammu was fought in which Raja Braj Dev secured victory.
[5] He occupied the regency of Jammu State from 1735–1747, as Ranjit Dev had been arrested and imprisoned at Lahore between the years 1735–1747 due to the Mughals suspecting him of being disloyal to their governor of the hill region, therefore Ghansar served as regent in his elder brother's absence.