Nicholas II, the last Russian Emperor, was executed along with his family in 1917 by a Bolshevik firing squad. Their bodies were then secretly buried. In 1979, the unmarked graves of Nicholas II, his wife and three daughters were discovered and verified by DNA. In 1998 – about 80 years after their death – they were interred in the Chapel of St. Catherine within the Peter and Paul Cathedral. In 2007, the remains of his son and fourth daughter were uncovered.