Mithridates II or Mehrdad the Great (Tears IX) is the ninth Shah of Iran from the Parthian dynasty, which ruled from about 124 to 87 BC. He was given the title of “great” because of his power and order in organising the border of Iran.  He came to power when Iran was the target of invasion by various ethnic groups.

Mehrdad bravely and tactfully retook all the occupied territories and extended the borders of Iran to the mountains of the Himalayas in the east and to Mesopotamia in the west.  During his reign, Iran and Rome became neighbours.  He also organized the internal situation in Iran and established a flourishing economy.

Mehrdad II was the first Parthian king who, like the Achaemenid kings, called himself the king of kings.