List of largest empires in India history
1.King vikramaditya
King Vikramaditya made Ujjain his capital, in present-day Madhya Pradesh. He almost ruled whole Asia . Vikramaditya empire controlled many parts of Modern day China, Entire Middle East and Many Parts of South East Asia.

2. Lalitaditya Muktapiḍa —8 million sq. kms
King Lalitaditya Muktapiḍa of Kashmir ruled over 8 million sq. kms. Parihaspur was built by Lalitaditya Muktapida and served as the capital of Kashmir during his reign.
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The Undefeated Ruler of Kashmirwho defeated Islamic invaders & ruled till Caspian Sea .He captured parts of Central Asia and North india. His empire extended from Tibet to Iran and Turkistan.

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He was later able to create an empire based on Kashmir and covering most of Northern India and Central Asia including most parts of Pakistan, Afghanistan, Bactria , Iran, Nepal,Tibet, Turkistan and Soghdiana. He belonged to the Karkota dynasty.

3. Ashoka —5 million sq. kms
King Ashoka ruled over ruled over 5 million sq. kms. Ashoka, capital was Pataliputra, in present-day Bihar. Ashoka expanded Empire to reign over a realm stretching from present-day Afghanistan in the west to Bangladesh in the east and half of India .

Ashoka was grandson of Chandragupta Maurya and Chandragupta Maurya defeated Seleucus in India. King Ashoka covered part of India, Bangladesh , Pakistan , Nepal and Afghanistan .The Maurya Empire was founded by Chandragupta Maurya, with help from Chanakya.
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4. Deva Pala—4.6 million sq.kms
King Deva Pala ruled over ruled over 4.6 million sq.kms . Deva Pala the third ruler of the Pala Empire . Deva Pala covered part of Afghanistan ,Bangladesh , India, Nepal and Pakistan .His empire stretched from Assam and Utkala in the east ,Kamboja.

5. Samudra Gupta —3.5 million http://sq.km 
King Samudra Gupta ruled over ruled over 3.5 million sq.kms . Samudragupta, the second emperor of the Gupta empire the capital of which was Pataliputra, in present-day Bihar.
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His region extended from the Himalayasin the north to the Krishna and Godavari Rivers in the south; and from Balkh (Afghanistan) in the west to Brahmaputra River in the east. King Samudragupta covered part part of India ,Pakistan, Bangladesh ,Myanmarand Afghanistan .

6. Rajendra Chola —3 million sq. kms
Rajendra Chola belonged to the chola dynasty. His empire covered part of south India, Indonesia , Malaysia , Philippines and Maldives . He established Gangaikonda Cholapuram as the capital, in present-day Tamil nadu .

7. Shivaji Maharaj— 2.8 million sq. kms
Chhatrapati Shivaji Maharaj ruled over ruled over 2.8 million sq. kms. Chhatrapati Shivaji Maharaj was founder and first emperor of the Maratha Empire . He established Rajgad as the capital, in present-day Maharashtra.

His extending from Bengal in the east to Attock and Sindh in the west, Kashmir in the north to the Kaveri basin in the south. Venkoji, a half-brother of the Maratha king Shivaji, was the first Raja of Thanjavur from the Bhosale dynasty.

It is believed that he took over the administration of Thanjavur in April 1674 and ruled until 1684. TheVenkoji was the founder of the Thanjavur Maratha kingdom of bhonsle dynasty .

8. Kanishka —2.5 million sq. kms
king Kanishka ruled over ruled over 2.5 million sq. kms. Kanishkawas the greatest ruler of the Kushan Empire, a realm that covered much of present-day India, Pakistan, Afghanistan and China(Yarkandnow in the xinjiang region of china).

Kanishka had fought against King Han Ho-ti who was the king of Han dynasty of China. Kanishka defeated the Chinese king in the second attempt. Kushan that ruled over most of the northern Indian subcontinent and parts of Central Asia. The capital was located at Peshawar.

9-Govinda III —1.5 million sq. kms
king Govinda III ruled over ruled over 1.5 million sq. kms. Govinda III was a famous Rashtrakuta ruler and his capital city is Mayurkhandi in present-day Karnataka .

He was militarily the most successful emperor of the dynasty with successful conquests-from Cape Comorin in the south to Kannauj in the north, from Banaras in the east to Broach (Bharuch) in the west .

Rashtrakuta kingdom included the modern state of Karnataka in its entirety along with parts of the current Indian states of Tamil Nadu, Andhra Pradesh, Telangana, Maharashtraand Gujarat

10. Harsha — 1 million sq. kms
Harshavardhana ruled over ruled over 1 million sq. kms His Empire covered much of North and Northwestern India, extended East till Kamarupa, and South until Narmada River; and eventually made Kannauj (in the present Uttar Pradesh state) his capital.

Harsha ruled over a vast territory consisting of eastern Punjab, Uttar Pradesh, West Bengal, Bihar, Orissa under their control.

11. Mihira Bhoja— 1 million sq. kms
Mihira Bhoja ruled over ruled over 1 million sq. kms His Empire covered much of western and northern India.

He was a ruler of the Gurjara-Pratihara dynasty and his capital city is Kannauj in present-day Uttar Pradesh. Bhoja's empire extended to Narmada River in the South, Sutlej River in the northwest, and up to Bengalin the east.

It extended over a large area from the foot of the Himalayasup to the river Narmada and included the present district of Etawah in Uttar Pradesh.

12. Krishnadeva Raya— 0.6 million sq. kms
Krishnadeva Raya ruled over ruled over 0.6 million sq. kms. His Empire covered much almost the entire South India . He was a ruler of the Vijayanagara Empire and his capital city is Hampi in present-day Karnataka.

His empire extended from the river Krishna in the north to River Cauvery in the south; the Arabian Sea in the west to Bay of Bengalin the east.

In the map there is 12 kingdoms and great kings of India so i mentioned them again will say list is long