thumb|Grave of duke Henry In 1235, Henry I was commissioned by the German emperor Frederick II of Hohenstaufen to accompany the imperial fiancée Isabella Plantagenet from England to Germany. However, he died en route in Cologne, before he could complete his assignment.
thumb|Grave of duke Henry In 1235, Henry I was commissioned by the German emperor Frederick II of Hohenstaufen to accompany the imperi.al fiancée Isabella Plantagenet from England to Germany. However, he died en route in Cologne, before he could complete his assignment