Soyarabai

Soyarabai Bhonsle ("née" Mohite) (died 1681) was one of the wives of Shivaji, the founder of Maratha Kingdom in western India. She was the younger sister of Maratha army chief Hambirrao Mohite.
Early life.
She was married to Shivaji at a very young age in 1642. The marriage took place when Shivaji visited his father Shahaji at Bangalore with his mother Jijabai. 
After the death of Jijabai in 1674, Soyarabai became more important in Shivaji's family. This was also true for Maratha court politics. Soyarabai had two children with Shivaji, daughter Balibai and son Rajaram.
Imprisonment.
Shivaji died in 1680 at his capital without naming any successor. In order to continue the empire, Soyarabai got her ten-year-old son, Rajaram as the only legal successor to the throne. But her stepson and heir presumptive Sambhaji, was able to stop this. They took help from Soyrabai's own brother, army chief Hambirrao Mohite and put Soyarabai and Rajaram in prison. They took the full power and Sambhaji became the "Chhatrapati" on 20 July 1680. 
Death.
After that, she tried all ways to de-throne him. Soyarabai's followers tried to poison Sambhaji in August 1681, but he survived. When he learnt about the plot, he had no other choice but to kill Soyarabai with poison. Many plotters including Soyarabai's relatives of the Mohite family were also slaughtered or trampled by the elephants.