In 2152, Duras, son of Toral was demoted to second weapons officer and sent to serve at Ty'Gokor's defense perimeter after his failure to apprehend the Raatooran rebels at the hands of Captain Jonathan Archer of the Enterprise NX-01. (ENT: "Judgment")
By 2373, Chancellor Gowron had moved Klingon military headquarters from Qo'noS to Ty'Gokor. The planetoid was protected by a powerful defensive shield and a tachyon detection grid, as well as several orbital facilities. At least thirty Klingon warships were stationed near it at all times.
A small team led by Captain Benjamin Sisko was able to infiltrate Ty'Gokor with the help of Gul Dukat's stolen Bird-of-Prey. There, they exposed General Martok as a Changeling. (DS9: "Apocalypse Rising")
Background information Edit
According to the script for "Apocalypse Rising", Ty'Gokor's name was pronounced as "TIE-go-kor". 
Ty'Gokor is also mentioned in The Left Hand of Destiny, Book Two.
The Klingon trading station in Star Trek Armada 2 appears much like the stations in orbit of Ty'Gokor.