In Larry Niven's fictional Known Space universe, the Thrintun (singular Thrint) were a long-extinct species which ruled the galaxy through telepathic mind control. The Thrintun were nearly destroyed about two billion years before the human era by one of their slave races known as the Tnuctip, and used one of their own devices to amplify a telepathic command ("die") across the galaxy in an event they called "Suicide Night" so as to take their slave races with them. The story is partially told in the novella The World of Ptavvs and the story Peter Robinson from the book Man-Kzin Wars X.