The Colonnas in Corsica are a bit like the Smiths in Britain. We are numerous. But in smart Parisian circles, the mention of this name sends a chill through the room. Yvan Colonna, a member of my extended clan (though not a known relative), was the most notorious Corsican nationalist of his time. He was convicted of the 1998 killing of a Préfét of Corsica, the highest republican official on the island. Last month, Yvan was himself murdered in a mainland French prison.