Gollum was born is 2440 and
died March 3019 (third age) another name for Gollum is smeagol. Gollum was
originally a hobbit who found the One Ring in the river Anduin where Isildur had
lost it more than two millennia before coming under it's power. He hid away in
the misty mountains and was drawn into the events at the end of the Third Age
when he encountered Bilbo Baggins who took the ring from him.
Gollum first appears in the tale of years in about 2463 when he murders his
friend Deagol and steals the ring. The birthrate of 2440 given here is a
estimate on the assumption that Gollum would have been about 25 years old at the
date. His life span was about 600, this being far longer than a normal hobbit
would live, but then this was a side effect of the ring.
Gollums Identification as a Stoor is based on Gandalfs word in the Lord of the
rings - I guess they were hobbit kind akin to the fathers of the fathers of the
Stoors. Gollums people split from the other Stoors in the fifteen century on the
third age, when troubled times in Eriador led them to migrate back eastwards
over the Misty mountains and settle at the banks of the Gladden river.