"Their Majesties King Albert II and Queen Paola want to thank you cordially for the words of consolation that They were happy to receive after the death of Her Majesty Queen Paola", the message says (see below). It was sent to an estimated 150 members of the public.
The caption says "Belvédère" after the name of Albert's and Paola's residence in Laken. The French version of the message is correct. A spokesman for the Royal Palace is talking of a "human mistake". A new card will be sent with apologies.
Fabiola passed away at the age of 86 last December. She was the widow of the former King Boudewijn, Albert's brother. Albert's spouse Paola is presently 77 and is reported to be in good health.