Uruk-hai first bred in Mordor (estimated date)
Event Type: Cultural/Social
Age: 3rd Age - The Stewards
The Morgul-lords [had] bred in secret a fell race of black Orcs in Mordor....
The Peoples of Middle-Earth, HoME Vol 12, Part 1, Ch 7, The Heirs of Elendil: The Ruling Stewards of Gondor
In the last years of Denethor I the race of uruks, black Orcs of great strength, first appeared out of Mordor, and in 2475 they swept across Ithilien and took Osgiliath.
The Return of the King, LoTR Appendix A, Annals of the Kings and Rulers: Gondor and the Heirs of Anárion: The Stewards
The date is an estimate, set ten years before the event Osgiliath ruined and its bridge broken, to mimic the ten-year lag time between the events Saruman begins breeding Orcs in Isengard and Orcs (including Uruks of Saruman's) begin to raid Rohan and steal horses.
Elena Tiriel 22Oct05