(Updated, reworked version of the old blog)
The very first bearer of the name was a half-elf under the alias Ultima Nelthar, In life he worked in the shadows and destroyed many an empire in his time. The empires were quickly erased from history along with his true name. How he managed to do this is Unknown, but in death he is worshipped by the Nelthars as a god, if this is true then it may explain how he accomplished his deeds.
Founder: Ultima (II) Nelthar(deceased)
The Nelthar clan is a Powerful and Rich family, made up of almost every race in Nirn. The Nelthar clan is extremely mysterious, politics within the clan is obscure and how they govern themselves is quite unknown. But a comfirmed fact is that they have outpost in every province in tamriel and some hideouts on certain other continents. Each outpost is led by an "executive" member of the Nelthars, always of the appropriate race for the region they lead.
The Nelthars make occasional visits to important people, like Jarls, Kings and other leaders or people of great power. Usually it's in order to secure connections outside Cyrodiil but the Nelthars always disappear later on, the longest recording of Nelthar activity is three years by one og the heads: Nait Nelthar, traveling throughout hammerfell.
The Nelthars, come mostly from Cyrodiil. Altough not related by blood they treat each others as such.
The Nelthars first appeared during the 2nd era year 20 when it was first founded by "Ultima the second" a powerful human, said to be able to bring down great mountains with little to no effort. It reappeared through the 3rd era before it vanished again at the end of the oblivion crisis, then they reappeared again in the 4th era just before the dragon crisis. making the Nelthar clan exactly 1368 years old in 4th era 201.
Later records have proven that there are 3 people with unparalelled power over the Nelthars, though they do however not carry the name.