G'trok was a Klingon poet who wrote The Fall of Kang, which, in the mid-24th century, was required reading at Starfleet Academy.
Federation terraformer Gideon Seyetik was an aficionado of G'trok's work. though he found "The Fall of Kang" to be "a bit obvious". (DS9: "Second Sight")
This character was only mentioned in dialogue.