An article in News Scientist says:
Freak winter is Europe's warmest for 700 years - earth - 20 June 2007 - New Scientist Environment
Separately, the temperatures experienced during autumn 2006 and winter 2007 are likely to have been the warmest in 500 years, they say. But the sequential combination of two such warm seasons is a still rarer event - probably the first since 1289.
Nomad or anyone, do you know more about this?
Luterbacher says the 1289 temperatures may have been caused by a large volcanic eruption in the tropics
The 1289 date, however, comes like a rabbit out of a hat to me. Have not heard of this before. (Large volcanic eruptions can indeed lead to regional warming (see example from Pinatubo here), even when it leads to global cooling.