Thekkumkur rule (c. 1100 AD - 1753 AD)

From the beginning of the ninth century AD, the history of Thekkumkur and of Kottayam are virtually indistinguishable. Kottayam was then a part of Vempolinad, an area in the Kulashekara Empire (800–1102  AD). By about 1100, the Kingdom of Vempolinad had split into the Kingdoms of Thekkumkur and Vadakkumkur, and the latter became a vassal of Cochin.

The royal house had originally been situated in Vennimala in Kottayam. It was protected by a fort known as Thaliyilkotta and, as a result, the locality came to be known by the same name as the fort. Afterward, Thekkumkur kings shifted their capital to Nattassery near Kumaranallore at the outskirts of Kottayam town. It is believed that the Thekkumkur dynasty ruled Kottayam from Thazhathangadi. Rulers of Munjanad and Thekkumkur had their headquarters at Thazhathangadi in the present Kottayam town. Marthanda Varma of Travancore attacked Thekkumkur and destroyed the palace and the Thaliyil fort. The remnants of the palaces and forts are still seen here.

The Portuguese and the Dutch established trade relations with both of these kingdoms, dealing in black pepper and other spices. After the subjugation of the Dutch East India Company by the Kingdom of Travancore in 1742, military operations of Marthanda Varma progressed against the northern neighboring kingdoms, including Thekkumkur.

Though Thekkumkur allied with Chempakassery and Vadakkumkoor to protect the kingdom, all of them were finally annexed to Travancore. Another source states that the ruler of Thekkumkur had sided first with the Kingdom of Kayamkulam and then with the principality of Ambalapuzha against Travancore. After the fall of Ambalapuzha, and as the ruler of Thekkumkur refused to come to terms with Travancore, his capital city was taken on 11 September 1750 by Ramayyan Dalawa, the general and prime minister of Marthanda Varma, and the state was annexed to Travancore in 1753.

During British rule in India, Kottayam remained a part of the Princely State of Travancore.

Travancore rule (1753 - 1949)

In 1817, the Church Missionary Society of England established CMS College as the first Western-style college in Kerala. It was welcomed by the Travancore government to provide administrators for the public bureaucracy.

Kottayam has played its role in all the political agitations of modern times. The ‘Malayali Memorial ‘ agitation may be said to have had its origin in Kottayam. The Malayali Memorial sought to secure better representation for educated Travancoreans in the Travancore civil service against persons from outside. The Memorial, which was presented to the Maharaja Sri Moolam Thirunal (1891) was drafted at a public meeting held in the Kottayam Public Library. The event marked the beginning of the modern political movement in the State. It was here that the famous Vaikom Satyagraha (1924–25), an epic struggle for eradication of untouchability, took place. Scheduled castes and other backward classes in Travancore were denied not only entry into temples, but also access to temple roads. Vaikom, the seat of a celebrated Siva Temple, was the venue of the symbolic satyagraha.

Indian Rule (1949 - Present)
Kottayam became a revenue division of Travancore. A fifth division, Devikulam, existed for a short period but was later added to Kottayam. At the time of the integration of the State of Travancore and Cochin in 1949, these revenue divisions were redesignated as districts and the Diwan Peshkars gave way to district collectors, with the Kottayam district established in July 1949.