[2] His brother died from a fall off a horse in 1781 and Rajadhi Rajasinha ascended to the throne in early 1782.

His second wife was Upendra Ammal Devi who was arrived from Rameshwaram, South India.

He appointed Siriyammal Devi as his fourth wife, who was another younger sister of the Queen Consort.

Lady Subbramma Nayak, who was a younger sister of second consort Upendra Ammal Devi became Rajadhi Rajasinghe's mistress after her husband’s death.

Hugh Boyd visited the Kandy court shortly after Rajadhi's accession and noted that the court was divided into different factions based on support of the Dutch, with the pro-Dutch faction in the strongest position.