The First Age of the Sun:

The First Age of the Sun. The beginning of the First Age of the Sun was when the Sun first rose, and the end, when Beleriand was destroyed in the war between the Valar and Morgoth. Other events in the First Age included the following:

The building of Gondolin
Morgoth's breeding of the race of Dragons
The Eldar meeting the Atani in Beleriand
The first of the Noldor to meet any of the Atani was Finrod Felagund and he met with the House of Bëor.
The Quest of the Silmaril
This ended with Beren wedding Lúthien and of this line came Elwing and eventually the Half-Elven and the line of the Kings of Númenor.
Nirnaeth Arnoediad, The Battle of Unnumbered Tears
Dagor Aglareb, the Glorious Battle
The Fall of Gondolin, the longest lasting of the realms of the Elves in Beleriand

This is a small selection of the events of the First Age of the Sun.