Legolas is the son of Elvenking Thranduil of the woodland Realm of Northen Mirkwood,who appears as "the Elvenking" in The Hobbit.  His father rules over the Sindran Elves who dwell there.

Legolas was selected to represent the Elves in the Fellowship of the Ring. His endurance, keen sight, and fighting skills were of great help on the quest, but his loyalty and friendship were even greater assets to his companions. Legolas grew fond of the Hobbits and he loved and suported Aragorn but the strongest bond he formed was with Gimli the Dwarf.

Legolas and his friends reached Lothlorien, the golden wood, after facing many dangers, such as Caradhadas, Sauron's wolves in Hollin, and Moria.  In Lothlorian, Legolas serves as an intitial spokesperson for the company, speaking for the Gladrihim, whom he consinders close kin.  They take the leave, but not before they receiving several gifts. There, Legolas receives a new longbow and cloak from lady Galadriel and lord Celborn. 

While the Fellowship is on the River Anduin, Legolas shoots down a fell beast with one shot. After Boromir is killed and Merry and Pippin are captured, he, Aragorn and Gimli set forth in pursuit of the two (Frodo the Ring-bearer and Sam have left to destroy the Ring). Meeting the revived Gandalf and the Rohirrim, they fight at the battle of Hornburg,and witness Sauraman's (partial) downfall at Isengard, where they meet the two abducted Hobbits. In the battle of Hornburg Legolas and Gimli engage in a Orc-slaying contest (Gimli wins by one killing 42 to 41, but the real result is stronger mutal respect.) 

When  Aragorn passes through the Pass of the Dead  Legolas and Gimli acompany him, along with the Grey Company