Image Source: http://www.bgst.edu.sg/realia/o13-14.htm
The incident is also described in Mark 14:1-9. Luke 7:36-50 also has an anointing but some of the details are different such that commentators believe that passage described a separate story. John 12:1-8 also relates this beautiful picture of devotion and provides the additional details that Martha served, Lazarus was reclining at the table and that Mary is the one anointing Jesus. Martha, Lazarus and Mary are brothers and sisters and good friends of Jesus.
Mary, the mother of Jesus is well known throughout the Christian era. Mary Magdalene has been getting a lot of publicity because of the Da Vinci Code. In traditional Christian circles, Mary Magdalene is recognized as the first person to see the resurrected Jesus. The third Mary, the one in this episode, is Mary of Bethany, the sister to Martha and Lazarus.