Richard was arrested and imprisoned in December 1192 by Leopold V, Duke of Austria, who suspected Richard of murdering Leopold's cousin Conrad of Montferrat. Leopold had also been offended by Richard casting down his standard from the walls of Acre. He was later transferred to the custody of Henry VI, Holy Roman Emperor, and it took a ransom of one hundred and fifty thousand marks to obtain his release. Richard returned to England in 1194 and died of a crossbow bolt wound in 1199 at the age of 41.