Thekkumkoor (തെക്കുംകൂര് in Malayalam), also transliterated Thekkumkur or Thekkumcore, was a small independent kingdom that existed before 1749 in the southern part of Kerala in India and was ruled by a royal household known as Thekkumkoor Kovilakam, from a place called Thaliyilkotta near Thazhathangadi in the present day town of Kottayam. Thaliyilkotta (lit. Thaliyil Fort in Malayalam) was the name of a fort that existed there at that time. It was destroyed during the invasion by Marthanda Varma of Travancore who annexed it 1749 and 1754.
From the beginning of the ninth century AD, the history of Thekkumkoor and of Kottayam are virtually indistinguishable. Kottayam then was a part of Vempolinad, an area in the Kulasekhara Empire (1090 - 1102 AD). By about 1100 AD, the Kingdom of Vempolinad had split into the Kingdoms of Thekkumkur and Vadakkumkur.
Later, the Portuguese and the Dutch established trade relations with both these kingdoms, dealing in black pepper and other spices.
Towards the end, the Thekkumkure Royal Family only controlled the small area of Kovilakam of Kolathu Kara Kozhanchery.
Edathil Bhagavathy is the paradevatha of the Thekkumcore Royal Family. The main pūjā is performed on Medam 18 (which usually it falls on May 1) every year. The pūjās are performed by the thandri from surya Kaladi Mana. There will be a thrikala pūjā (meaning pūjās in the morning, noon & evening) on this day. It is a day for family get-togethers as well.
Daily pūjās are performed by the Vadakkummal family. Vadakkummal Vikraman Namboodiri is the current main priest. The last day ceremony of the Kumaranallor Temple Ulsavam, the ārāttu (the day after the Thrikkarthika) is performed at the Meenachil River which is close to the Edathil Temple (2 km away from Kumaranalloor Devi Temple). The ārāttu is performed near the Edathil Bhagavathi Temple once every year since Kumaranalloor Bhagavathi comes to see her sister the Edathil Bhagavathi. During the month of January Bhagavata Purana Sapthaham with Bhagavathom Moolam is conducted every year.