The Battle of Thapsus was a military engagement that took place on April 6, 46 BC near Thapsus. The forces of the Optimates, led by Quintus Caecilius Metellus Scipio, were defeated by the forces of Julius Caesar. It was followed shortly by the suicides of Scipio and his ally, Cato the Younger, the Numidian king Juba, and his Roman peer Marcus Petreius.