Khanate of Kalat
The Khanate of Kalat was a Brahui Khanate that originated from the Kalat region of Pakistan. Formed in 1666 due to the threat of Mughal expansion in the region, it controlled the wider Balochistan at its greatest extent in the mid-18th century, extending from Kerman in the west to Sindh in the east and from Helmand river in the north to the Arabian sea in the south. Khanate of Kalat lost considerable area to  Qajar Iran and Emirate of Afghanistan in the early 19th century, and the city of Kalat was itself sacked by the British in 1839. Kalat became a self-governing state in a subsidiary alliance with British India after the signature of the Treaty of Kalat by the Khan of Kalat and the Baloch Sardars in 1875, and the supervision of Kalat became task of the Baluchistan Agency. Kalat was briefly independent from 12 August 1947 until 27 March 1948, when its ruler Ahmad Yar Khan acceded to Pakistan, making it one of the Princely states of Pakistan. Origin 
The Khanate of Kalat was the first unified polity to emerge in the history of Balochistan. It took birth from the confederacy of nomadic Brahui tribes native to the central Balochistan in 1666 which under Mir Ahmad Khan I declared independence from the Mughal suzerainty and slowly absorbed the Baloch principalities in the region. It was ruled over by the Brahui Ahmadzai dynasty till 1948. History

Background 
The Baloch tribes had founded a Baloch confederacy under Mir Jalal Khan, the eponymous ancestor of Baloch people, in the 12th century. A second Baloch confederacy was established under Mir Chakar Rind with Sibi as its capital in 1487. However, the 30 year Rind-Lashari War (1482–1512) destroyed the power of the Baloch tribes, and Mir Chakar Rind was forced to migrate with his tribe towards Indus valley. This allowed the previously oppressed Brahuis to obtain political power, who eventually formed the Khanate of Kalat by ousting the Mughal governor. Establishment 
The Khanate of Kalat was founded in 1666 by Mir Ahmad Khan. Soon after, a Mughal force invaded from Kandahar and occupied Quetta, Mastung, and Mangocher. In 1667, this force was decisively defeated in the Quetta valley and the khanate managed to regain the occupied districts along with Chagai. Samandar Khan was summoned to Multan by the Mughals and Kerman by the Safavids. The Mughal prince paid tribute to Samandar Khan whereas Safavid Beglar Begi presented Samandar Khan with a robe of gold, and paid tribute. Under Mir Abdullah Khan I (r.1713–34), the state expanded from Upper Sindh to Persia till the port of Bandar Abbas. The Khanate reached its peak during the reign of Nasir Khan I (r.1749–94), who had unified the Kalat region and conquered cities of Khash, Bampur, Qasr-e Qand and Zahedan in the Iranian Balochistan. Since 1748, Kalat was a vassal state of Durrani Empire, and assisted in the campaigns of Ahmad Shah such as in the Durrani Campaign to Khorasan. However, in 1758 Mir Nasir Khan I revolted against Ahmad Shah. The Afghans were dispatched under Shah Wali Khan to Kalat, but were defeated. As a result, Ahmad Shah marched himself with an army and defeated the Baluch armies in battle. Ahmad Shah laid siege to Kalat for over 40 days, and attempted to storm it, however it was unsuccessful. In the ensuing 1758 treaty of Kalat, the exact agreements are disputed. Some sources state that the Khanate of Kalat attained a sovereign status. According to some other accounts, Mir Nasir Khan had recognized suzerainty of Ahmad Shah, who guaranteed non-interference in the matters of Kalat. Nevertheless, Kalat did not pay any tribute to Durrani Empire thereafter, and provided military contingents in exchange of money only. Following the collapse of the Durranis, any trace of Afghan influence over Kalat ended after the death of Sher Dil Khan, the ruler of the Principality of Qandahar, in 1826. Decline 

The Khanate of Kalat declined in the early 19th century, losing much of its territory to Qajar Iran and Emirate of Afghanistan. The internal weakness of the state forced Khan of Kalat to sign the Treaty of Kalat (1876) with the British Agent Robert Sandeman in the late 19th century. Parts of the state to the north and northeast were leased or ceded to form the province of British Baluchistan, which later gained the status of a Chief Commissioners province. The Iran–Kalat Border was demarcated in 1896, and the former territories of Kalat Khanate now form part of Iranian province of Sistan and Balochistan. Accession 
The political centralization of the Khanate of Kalat failed to survive through the colonial era and did not lead to the standardization of the Baloch language. However, with the  withdrawal of the British from the Indian subcontinent in 1947, the Indian Independence Act provided that the princely states which had existed alongside but outside British India were released from all their subsidiary alliances and other treaty obligations. The rulers were left to decide whether to accede to one of the newly independent states of India or Pakistan (both formed initially from the British possessions) or to remain independent outside both. As stated by Sardar Patel, "On the lapse of Paramountcy every Indian State became a separate independent entity." The Instruments of Accession made available for the rulers to sign transferred only limited powers, namely external relations, defence, and communications. The Shahi Jirga of Baluchistan and the non-official members of the Quetta Municipality, according to Pervaiz Iqbal Cheema, stated their wish to join Pakistan on 29 June 1947; however, according to the political scientist Rafi Sheikh, the Shahi Jirga was stripped of its members from the Kalat State prior to the vote. Kalat remained fully independent from 15 August 1947 until 27 March 1948, when its ruler, Ahmad Yar Khan (1904–1979), finally acceded to Pakistan, becoming the last of the rulers to do so. Show elections were held during this period and a bicameral parliament was established. On the night of 27 March, All India Radio carried a story about Yar Khan approaching India with an unsuccessful request for accession in around February. The next morning, Yar Khan put out a public broadcast rejecting its veracity and declaring an immediate accession to Pakistan — all remaining differences were to be placed before Jinnah, whose decision would be binding. Dushka H. Saiyid emphasizes that Yar Khan lost all of his bargaining chips with the accession of Kharan, Las Bela, and Makran, leaving Kalat as an island. Salman Rafi Sheikh largely concurs with Saiyid's assessment: multiple other Kalat sardars were preparing to accede to Pakistan and Yar Khan would have hardly any territory left, if he did not accede. On 3 October 1952, the state of Kalat entered into the Baluchistan States Union with three neighbouring states, 
Kharan, Las Bela, and Makran, with Yar Khan of Kalat at the head of the Union with the title of Khan-e-Azam. The Khanate came to an end on 14 October 1955, when it was incorporated into West Pakistan. Geography 

The Khanate of Kalat covered the area of . The territories of the Khanate of Kalat flactuated throughout its history. At the time of death of Mir Nasir Khan I in 1794, it comprised the Iranian province of Sistan and Balochistan, parts of Sindh and Afghan Balochistan as far as the Helmand river. Significantly reduced in the late 19th century, the princely state of Kalat occupied the central part of the territory of modern-day Balochistan province in Pakistan. To the north was the Baluchistan (Chief Commissioner's Province), part of British India. Administration 
Kalat state was divided into following sub-divisions:
 Jhalawan, an ethnic Brahui subdivision, headed by the chief nawab of the Zarakzai tribe, known as Chief of Jhalawan
 Kacchi, an ethnic Sindhi subdivision, in which various tribes had their own tribal lands under the Khan of Kalat
 Sarawan, an ethnic Baloch subdivision, headed by chief nawab of Raisani tribe, called chief of Sarawan

Rulers of Kalat 

The rulers of Kalat at first held the title of Wali but in 1739 also took the title of (Begler Begi Khan), usually shortened to Khan. The last Khan of Kalat () had the privilege of being the President of the Council of Rulers for the Baluchistan States Union. They also had the title of beylerbey. 