Nothing is known of the time before first era.

The Primary Races came upon Myaasia at aproximately the same time. the way they came is a mystery, but legends claim about the same time. Kuor and Valris were present at this time

The Races start to consolidate and build empires

Apparent first mention of dragons and other elemental beings Also first mention of Dural.

Two great empires come into being, one a Iylari one other a Uruk-Hai one. The Great Empires eventually come into conflict.

The Great Elf-Orc wars, with other races as either allies of victims in the war to death. The Wars lasted for about 200 years killing uncounted millions. The total population of myaasia went down to about a quarter the prewar levels. Eventually both armies run out of forces, as both Iylari and Uruk-Hai breed slowly and the subject races started to revolt, bringing down the 2 empires.
Thus up to this day, the Uruk-Hai and The Iylari are people of low numbers.
First mentions of Reann.

After the great wars ended counting of periods started again at the beginning of second era