Dragonlord Placidusax once possessed five heads, each bearing their own soul.
The first head was the price of victory, torn away as Placidusax contended with the Twinbird. Twice the dragon triumphed over the god of death, holding it at bay while Uhl ignited the fire of the Crucible. Upon their third clash the Twinbird ripped away one of the dragon's heads, only to flee when it saw the Flame of Ruin blazing upon the mountaintops. This head would be the birth of Gransax, mightiest of dragons.
The second head was also lost to battle, though not to victory. While Marika and her shadow-beast entered the World Tree to challenge Uhl and his Fell God, Placidusax entered into battle with the champion Godfrey. The dragon did not falter when a head was lost to the Tarnished lord's axe. But when Placidusax saw Marika emerge from the tree alone, they fled the battlefield in despair. The second head would give rise to Dread Fortissax, the bitter, the revenger.
When he saw his sire flee the field, Gransax descended upon the Dragonlord in a fury. He cursed Placidusax for a coward and bade them stand and fight. But they would not be held, and as Gransax sought to halt them Placidusax tore away, leaving a third head in the jaws of their greater scion. This head would give life to Lansseax, a quisling to some, and a peacemaker to many more.
Credit to @katyahina for the idea of ancient dragons reproducing through budding.