Lee Kuan was a noted Human historical political despot on Earth sometime between the mid-20th and the 23rd century, who ultimately failed at his goals of conquest and absolute power.
Spock put him in one line with Ramses, Julius Caesar, Alexander, Napoleon and Hitler to show that Earth history is full of men seeking absolute power. (TOS: "Patterns of Force")
Fleet Captain Garth of Izar boasted to Captain James T. Kirk that as Master of the Universe, he would go much farther and have more success then other previous despots such as Lee Kuan, Alexander the Great, Caesar, Napoléon Bonaparte, Adolf Hitler, and Krotus. (TOS: "Whom Gods Destroy")