After a lengthy and arduous labour which lasted into the longest night of winter, did Noruímîr, wife of the ranger Celonthor, give birth to a healthy boy. It had been bitterly predicted by the midwives that the birth would end in sorrow, come too late and heralded by terrible pains for the mother, their fear were that neither the mother or her child would survive the frightful labour. When Noruímîr did finally deliver her child, both of them would live. Celonthor declared to his wife this was their night of their greatest triumph and thus named his son Gelldûr.

Gelldûr grew up to follow in his father's footsteps, like many other young men of the Dúnedain, he swore an oath of service to his chieftain and left home to wander the north in protection of it's people against the Enemy. Early in life he first glimpsed the great eagles flying over the Misty Mountains, enthralled with their beauty, the trail at the foot of the mountains and the passes soon became his favoured paths to patrol. Since then he would often spy skywards to seek another glimpse of the elusive lords of the sky, which earned him the nickname Thorontír from his friends. He took the gently mocking name to heart, later widely referred to this way among his companions. 

Following the call of the Grey Company to ride south at the summons to war from his chieftain Aragorn, Thorontir made the controversial decision to stay in the north. After a strained exchange with Halbarad's messenger Thorontir declared his intent to linger and spread word to his brothers scattered into the remote corners of Eriador that their long-held vigil would now be stretched precariously thin.

He would remain behind to gather a small band of trusted companions to uphold their oath of protecting the free people of the north against a mysterious new threat from the south. Rising to the role of unofficial leader during their efforts, he was affectionately dubbed Captain Thorontir, a title which firmly stuck among his followers despite that he had never been bestowed such a rank by his senior kinsmen. 

Presently Thorontir enjoys a relative measure of peace in overseeing partial responsibility over a small, hidden outpost of his kinsfolk based on the shores of the lake Nen Harn, providing passage between the North Downs and Bree-land for his people by boat. By his own design it has been dubbed - with a reserved dash of humour - Enedhûb, or the Middleport.