Co-regency is a political arrangement where two rulers govern simultaneously, often to ensure a smooth transition of power. This practice allows an experienced ruler to share authority with a successor, providing guidance and training for the new leader. Co-regency can help maintain stability within a kingdom or empire during times of change. Historically, co-regency was common in ancient civilizations, such as Egypt, where pharaohs would appoint their heirs as co-regents. This system ensured that the successor was prepared to take over the throne, minimizing potential conflicts and power struggles after the reigning ruler's death.