At the conclusion of these negotiations he was taken prisoner while still under safe conduct, and imprisoned in his own dungeon, where he died, possibly of dysentery, though there were suspicions of poisoning.
Ved afslutningen af forhandlingerne blev han taget til fange på trods af det frie lejde og indespærret i sin egen fangekælder, hvor han døde, muligvis af dysenteri, selvom der var mistanke om forgiftning.