After his death, he was succeeded by his daughter-in-law Ahilya Bai Holkar (1767-1795). She ruled with a great skill and understanding. Her rule became proverbial for justice and wisdom. Her regin is described as one of the uncorrupt rules in India. She contributed to the heritage of India by establishing several religious edifices remarkable in architecture. The Kashi Vishweswar temple at Varanasi being notable among them. Her unique pan-Indian look is reflected in the fact that she built Dharmashalas at Badrinath and Rameshwaram, established Anna Chhatras at Dwarka, Jagannathpuri, Omkareshwar and Ujjain. She also established charitable institutions at Gaya, Varanasi, Ayodhya, Prayag, Haridwar and Pandharpur. She was at heart a queen of whole India rather than that of the Holkar kingdom.
She was succeded by her commander Tukoji Rao Holkar. (of the same clan but no near relation.) On his death in 1797, his son Jaswant Rao became the ruler. He was a brilliant guerilla leader. In 1803, he defeated the Britishers and beseiged Delhi. He was however, defeated in 1804, and was compelled to make peace. Soon after, he became insane and died in 1811. In 1818, Indore became a part of British India empire and a British Resident stationed was at Indore.
In the 1857 uprising, 39 English subjects of Indore were killed. Indore was retaken by the British after a few months and Saadat Khan; who led the mutiny, was tried and sentenced to death.
Till 1947 Indore was a princely state. After independence, Indore state joined Dominion of India.
Source: Encyclopaedia Britannica