What event happened first, Von Heideck studying art, or accompanying the crown prince and future Ludwig to the congress of Vienna.
return Von Heideck studying art ;return accompanying the  crown prince and  future Ludwig to there  congress of Vienna ;return when  was  #1 ;return when  was  #2 ;return which is lowest of #3 ,  #4
['select', 'select', 'project', 'project', 'comparison']