Heraclius Constantine
January 11 641 through April 20 641
 
The eldest remaining son from Heraclius's first wife, was proclaimed Augustus and shared the throne with his half brother Heraclius Constantine.  He was sickly and died after a 100 day reign.  His half brother was very unpopular and forced to crown Constans II, son of Heraclius Constantine as co-emperor and was deposed in October of 641.