Final answer:
Vlad II Dracul was sent to the court of King Sigismund as a hostage for his father's loyalty.
Step-by-step explanation:
Vlad II Dracul was sent as a child or boy to the court of King Sigismund as a hostage for his father's loyalty. The practice of sending children from noble families as hostages was common during this time as a way to ensure loyalty and prevent rebellions. By keeping Vlad II Dracul at the court, King Sigismund had leverage over his father's actions, knowing that any disloyalty would result in harm to his son.