Tycho Brahe had an unfortunate event at one time. He and a guy by the name of Parsberg, got into arguments frequently at events that they both intended, over who was the best mathematician of all time. This continued for quite a while. Until one challenged the other to a duel, where Parsberg cut off Tycho's nose. He survived, but had to get an artificial one made of gold and silver (as seen below). He was know for this incident because from then on he looked silly. After his death, it was found that the nose may have also been made of copper. They found this out by digging up he grave and finding green marks on his skull. And as we know know when copper erodes it turns green.