In attempts to be freed, he dedicated the first treatise to Carolus Rym (Charles Ramire), ambassador to the Holy Roman Emperor Maximilian II, and the second treatise to François de Noailles, bishop of Aire and ambassador to the King of France. They were pleased with his works, and endeavoured to obtain his release. Their efforts, however, were brought to light as he was being released to the Italian ambassador. The prison captain ordered him to be detained and executed by strangulation.