|Last Exile character|
Henry Knowles at Horizon Cave
|First appearance||Calculate Alex|
|Created by||Range Murata|
|Voiced by|| Japanese |
|Date of birth||G.D596|
|Notable relatives||Charles Knowles (son)|
After the sinking of the Goliath by the Silvana, Duke Knowles seeks revenge on Alex Row for his son's death. He has armed henchmen abduct Alex from the auction at Horizon Cave. However, before he can kill Alex, Tatiana destroys the cave's power generators. Alex takes advantage of the blackout to kill Duke Knowles' henchmen and escape unscathed.