
Upto 1847 certain chiefs
were deprived of their sovereignty and their villages were lapsed to the
British area under the policy of lapse. In 1849 Ambala became the headquarters
of district4. Brief details of lapsed estates in the present Ambala district
(covering Yamuna Nagar area) are given below:_
Ambala tahsil
1. Patti Ambala 1823 63
2. Pargana Sulhar 1843 46
3. Pargana Adhoya 1850 39
Jagadhri tahsil
1. Bilaspur 1819 16
2. Jagadhri 1829 36
3. Buria 1836 28
4. Milak 1841 15
5. Dialgarh 1851 16
Naraingarh tahsil
1. Majra 1833 20
2. Gadauli 1840 5
3. Lalpur Nagla 1846 12
4. Naraingarh and Bharog 1847 89


In 1950, the Ambala district lost Kasauli and Sanawar to Kohestan district of PEPSU and 17 villages to Fatehgarh Sahib district of PEPSU and gained 6 villages from Patiala district and 115 villages and some forest area from erstwhile Kalsia State. In 1959, Nalagarh tahsil and Pinjore Kanungo circle of Kandaghat tahsil of Patiala district were transferred to Ambala district. The Pinjore Kanungo circle was added to the Kharar tahsil. The State of Haryana came into existence on November1, 1966. During the re-organisation of areas, the Ambala district was very much reduced in size. Of its six tahsils, the district lost Nalagarh tahsil to Simla district of Himachal Pradesh; Ropar tahsil and major portion of Kharar tahsil(282 villages and Kharar and Kurali towns) to the then constituted Ropar district of Punjab State and 36 villages and Chandigarh and Manimajra towns to the Union Territory, Chandigarh.
After the formation of Haryana State, the district comprised 3 tahsils (Ambala, Jagadhri and Naraingarh). The Naraingarh tahsil got 153 villages and Kalka town from the Kharar tahsil. In 1967, the above 153 villages and Kalka town were taken out of the Naraingarh tahsil and formed into Kalka tahsil. In 1978, the district had 4 tahsils (Ambala, Jagadhri, Naraingarh and Kalka). The administrative set up was decentralized into sub-divisions; Jagadhri (created in 1954); Naraingarh (created in 1956 ) and Ambala (created in 1968). A sub- tahsil of Raipur Rani was created in December, 1979. During November, 1989, the sub-divisional headquarters of Kalka were shifted to Panchkula. Panchkula and Buria tahsils were created in the Ambala district. Yamuna Nagar district was carved out of Ambala district by taking Jagadhri tahsil and Sadhaura sub-tahsil from Ambala district and Radaur block from Kurukshetra district. By the beginning of 1991, the district was divided into 3 sub-divisions (Ambala, Panchkula and Naraingarh); 5 tahsils (Ambala, Kalka, Panchkula, Naraingarh and Barara) and 2 sub-tahsils (Morni and Raipur Rani).
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