A Telmarine was any inhabitant of the Calormene colony, Telmar, in the Narnian World.
"Telmarine" can also be used to describe anything from, like, or relating to Telmar, its people, or its culture. The term Telmarine-Narnian also came about to refer to the Telmarine-native humans occupying the Kingdom of Narnia after the Telmarine Conquest in Narnian-year 1998.
The Telmarines that conquered Narnia were actually humans from Earth. On Earth, a group of pirates found an island with a cave that had an entrance to Narnian world. The pirates found the land of Telmar uninhabited, the original colony of Calormenes having been turned into dumb beasts by Aslan for their behavior and destroyed each other. The Telmarines prospered for years until a famine struck their land.
Caspian the Conqueror (Caspian I) was sent from Telmar to seek out new lands for his king. Upon arriving in the small northern country of Narnia, he found few men to fight. He found animals, talking beasts, and trees that could move and talk. After taking over the land, the Telmarines drove most of the animals into hiding as the men were scared of them, believing they were demons in animal form.
The free peoples of Narnia remained in hiding for 305 years. Around that time, Caspian X, the son of the usurped Caspian the ninth, was forced to flee his home in his Uncle Miraz's castle due to his Aunt, Queen Pruniprismia, giving birth to a son, making Caspian a hindrance to his uncle. He made an alliance with the beasts of Narnia, saying they would win back everything that was rightfully theirs. Also, the Pevensie children returned to Narnia and helped Caspian defeat his uncle in combat, freeing Narnia to once more be happy and free. Caspian was crowned king of Narnia after the defeat of his uncle's army.
After the fall of their dynasty, messengers were sent to all the Telamrines in Narnia, saying they could choose to stay or leave for a new home. A number of Telmarines stayed in Narnia while the rest chose to leave for Earth through a door that Aslan made for them.