The Linvris were a rival league of lesser Goa'uld who challenged the System Lords. There were nine of them, all of whom were found dead when SG-1 discovered a sealed chamber on PY3-948. They had been killed a month before by Ma'chello's Goa'uld killing inventions that had been released when a tablet with a page turning device had been activated. The symbiotes had died first, and the hosts had died shortly thereafter when they were unable to escape from the sealed chamber.
Episode Reference: Legacy