After 20 years, Professor van Westerland's horse Rupert died. He was 20 years, I guess that is not a bad age for a horse to die.
The gods of Avadon told us, that there never was a Rupert. Another person was carrying this name for two years apparently.
The professor is not taking it well. He swears he was riding Rupert for the last days, and Agga also assured us, the horse existed.