Who was lord Dalhousie? what was the policy that he devise to annex

Who was Lord Dalhousie? what was the policy that he devise to annex new kingdoms to the British empire? Name four kingdoms annexed by him through this policy?

Lord Dalhousie was the Governor General of India from 1848-56. He devised the policy of Doctrine pf Lapse. According to the Doctrine of Lapse introduced by Lord Dalhousie, if any Indian ruler died without leaving a male heir, his kingdom passed over to the British.

Four kingdoms annexed by Lord Dalhousie through this policy were Jhansi, Satara, Nagpur and Jaitpur.