question: Who was a Livonian Master first: Johann Osthoff von Mengede or Wolter von Plettenberg?
#1 return Johann Osthoff von  Mengede was  a Livonian Master 
#2 return Wolter von  Plettenberg was  a Livonian Master 
#3 return when  was  #1 
#4 return when  was  #2 
#5 return which is the  lowest of #3 ,  #4