There are many stories about how Amboori got its name. The first one is that the tribal settlers had a rice variety which will flower and ripen in a single day! It is called "Annoori Nellu". Later Annoori became Amboori. There is another story which is related to Chadachi Marthandan Pillai, who was a great archer of King Marthanda Varma. Once, the Chadachi Marthandan Pillai was participating in an archery competition in a place called Ottashekharamangalam. He shot an Arrow (Ambu) which landed in a tree at a far away place. While removing (oori) the arrow from the tree, he has placed a special marking in it. Later the surrounding area has known as Amboori (Removed the Arrow).

Amboori was inhabited by members of the Kanikar tribe since time immemorial. Around 1200 members are still living here with all cooperation to new settlers. During the year 1729, a princely state came up in the name of Thiruvithamcoor or Travencore under the rule of King Marthandavarma. The King had several enemies like "Ettuveettil Pillamar", who was trying to eliminate him. To escape from them, the King stayed in various places like Ammatha, Pathukaani, Kottamanpuram, and Meenmutty in Neyyar River belt. At that time, the Kani tribe was taking care of his safety and security. At a time, the tribe took him to a large boulder called the Dravyappara (the treasure rock), which is approximately 700 ft from its base and 1500 ft above sea level.

The King was very much pleased with the tribes courtesy and the way they took care of him. Before leaving this place to Tamil Nadu, the King has allotted the tribe approximately 36000 hectors of land in chembu pattayam, totally exempting from land tax, this area mostly falls under Neyyatinkara and Nedumangadu Taluks, Amboori too falls under that stretch of land.

Amboori became quickly famous after the Second World War. The princely state of Thiruvithamcoor or Travencore has experienced severe famine. Hence, the King has allowed Saint Thomas Christians of Kottayam region to settle in uncultivated Western Ghats ranges. The announcement from the King resulted in migration to this area in 1930. The new settlers used to walk from Kattakada to reach Pantha which is the early settlement of Christians.

Kochupuraykkal Kuryachan from Cheruvandoor, Punchaal Chacko, Thomman Mullankuzhiyil, and Maylakkuzhi Kutty from Anikkadu, Vattanthottiyil Mathan Vaidyar and his brother Devasya from Mattakkara were the first one to reach this place.

Even though they could start farming after clearing the forest, fighting with Animals, and some local goons, they couldn't take it further with harsh nature and diseases like Malaria. Mullankuzhiyil Thomman died in July 1931 and he has been laid to rest at Mylakkara Church. Other people also lost their health and slowly they left the area.

The second migration started in 1932 when a group of 50 families from the central Travencore reached here. They stayed in Tree Houses and started farming. Tragedy stuck again in the form of Malaria. Many lost their lives and some left to better places. The families to stayed back had a real tough time in the middle of the jungle. Finally, only 3 families – Mullankuzhi, Mylakkuzhi, and Paranjattu- were alive.

Another migration of around 75 families started in 1937 and ended up in 1944. The families spread from Panthaplavu to Karumamkulam area. Their experience was also not different. Most of them lost their dear once'. Finally, 13 families – including Chirakkathottil Devasya, Valliyanippuram Paily, Moonanal Families, Meeshouseppu, Muthiyamala Samuel, Puthenparambil Mamchan, Thuruthel Kunjouseppu, Kalayil Unnichettan- left behind.

Most of the first migrators settled in a place called Pantha which has better water sources for farming. Patha is located north of Amboori and near Mayam. Even though most of the people are Catholics, they didn't have a priest to take care of their spiritual needs. Rev. Fr. Adeyadathos O C D (Muthiyavila Valyachan) has reached there and started taking care of everyone without religious boundaries.

It is learned from the elders, that Fr. Adeyadathoos had miraculous powers. After he finished the house visits, the area was covered by high wind and the problems with several diseases like malaria came to an end. The children born after this period was alive and started growing up. Before that, all the newborns used to die.

Fr. Adeyadathoos has constructed a Church – St. Mary's Church in Mayam, which is the first Church in this area. Since, there was an order of the Catholic hierarchy that if any new church is constructed, it should have an educational institution as well, they have also started St. Mary's School in Mayam. This school also the first such institution in this area.

However, the decision to construct a dam in Neyyar River, forced the people of Pantha, mostly Syrian Christians, Pulayas, and Parayas to resettle leaving all their lively hood. Most of them resettled in Amboori.

By seeing the new gazette in 1949–50 to convert Amboori area into a fully agricultural sector, more families reached here and most of them were Christians. For the new migrants to stay temporarily, a shed has been constructed by Kottakkuzhiyil Joseph Vaidyan and the first Holy Mass was celebrated in this shed by Fr. Adeyadathoos. So, the history of Amboori is the history of St.George's Church too. Here it started after the final Holy Mass celebrated at Vettukallel Chacko's new house, celebrating Holy Mass at an individual's house has stopped.

To have a new shed for the church, a committee has taken charge under the leadership of Thadikkattu Varki Mani as Convenor and Odalaniyil Thomas, Odanalyil Joseph, Nadackal Varkki, Kudilil Kuryakkos, Edathattel Varki, Pallithazhathu Chacko, Muttuchira Chacko, Karuvayil Mathew, Moonnanayil Kochu Varki, Vettukallel Joseph, Vettukallel Chacko, Karimbaniyil Devasya Chandi, Koolipparambil Mathayi, Kudilil Agasthy, Valliyanippuram Paili, Mundolikkal Joseph and V T Antony Vellappallil were members in this committee. The first church had 40 ft length and 20 ft width. By this time around 85 families newly arrived.

The church shed was also used as a school. Kottur Kuriyakkos, who was appointed as Pastor in the Church was also started teaching here. Anchupankil Thomas, Kesari, Nadackal Abraham, Thekkel Philip, V A Joseph were also Teachers in this primary school.

While taking a survey of Amboori, it is learned that the property belongs to Chennellikkunnel Uthuppan and to buy this property him was unsuccessful. He has not even listened to Fr. Adeyadathoos, who have put his time and health to develop this area. Hence the faithful decided to shift the church a new place which is bought from Pattani A Varkki Vakkeel, who had around 200 acres of land in Amboori. Half acres of land had been bought by Rs. 150/- and another half acres he had donated. A new shed also came up for school.

In 1955, Rev. Fr. Joseph Malipparambil has been appointed as the Vicar of the Church. Fr. Jacob Thottanani, Fr. Losious, and Fr. Antony Puthoor helped him. Their combined effort has changed the face of Amboori. St. George LP School building has been completed. A new building for St. Thomas UP School has been erected and approval for the Schools has been received from Government. They also concentrated to develop nearby places like Arukani, Netta, Thekkupara, Dalmukham, Vavodu, and Venuthadam. Amboori has got a Post office in 10-07-1955, Roads linking Kudappanamoodu-Koottappu-Amboori, Vazhichal-Amboori, Aanamukham-Amboori, Pantha-Amboori, Thekkupara-Amboori has been developed with the help of all locals. During this time, Amboori also had a Library and Sports Club.

In 1961, under N E S Block, Perunkadavila a Health Center & Midwifery started here. In 1962, a private market established in Koottappu. The Amboori Co-operative Bank has started functioning from 29-03-1965. A Milk Society, Dairy Farm, Poultry Farm, Bee Farm, and Bamboo Societies established during the 1965–69 period by Fr. Antony Puthoor.Source: St. George's Church's Souvenir – 1988

St. Thomas Higher Secondary School
St. Joseph's Primary School
St. Mary's Upper Primary School, Mayam
Tribal Primary School, Puravimalai
Kovilloor LPS, Kannannoor
Govt. LP School, Kuttamala
Mar Baselieus English Medium School, Kuttamala
St. Mary's LP School, Thekkupara
S.H. Nursery school Thekkuppara
Industrial Training Centre for Scheduled Tribes, Kuttamala
Koottappu Gopalan Memorial Library and Research Institute, Koottappu