Historical observations of Jupiter were studied in a search for descri
ptions or depictions of spots of a magnitude comparable to that produc
ed by the impacts of comet Shoemaker-Levy 9 fragments with Jupiter in
July 1994. No such record was found. With the possible exception of th
e Great Red Spot, the Shoemaker-Levy 9 ''G'' spot appears to be the mo
st prominent jovian spot in history.