In 1965, the young "Prince" was sent abroad by his father Abraxas Malfoy.
In 1972, Lord Voldemort made the Horcrux - "Slytherin's Locket".
In the same year, 17-year-old Lucius took over as the patriarch of the Malfoy family. Abraxas is missing.
In July 1980, Abraxas returned to England with his young son and took away Lord Voldemort. The Death Eater affairs were managed by his young son, who was called "Dark Prince" by those familiar with the matter...