Mary, mother of Jesus
Protestants believe that Roman Catholics and Orthodox give Mary too much honor. Since the title "Mother of God", the Immaculate Conception and the Assumption of Mary are all teachings that are not found in the Bible, Protestants don't accept them. The Assumption of Mary is the teaching that Mary was taken up to heaven without dying.  Protestants believe that we can pray directly to God through Jesus, and do not need Mary or other saints to intercede for us.