Several rulers came to power at or around the age of 9:

• Edward VI of England was crowned king at age 9 in 1547 following the death of Henry VIII.

• King Tutankhamun of Egypt also became pharaoh at age 9 around 1332 BC. He ruled with advisers due to his youth.

• Henry VI of England was crowned king at just 9 months old, technically younger but still a notable child monarch.

• Other young monarchs ruled at even younger ages, for example King Oyo of Toro was crowned at age 3, and Sobhuza II of Swaziland started ruling at age 1 or shortly after birth.

Among these, Edward VI and Tutankhamun are prominent examples of rulers who specifically came to power at age 9. If you want to identify which ruler came to power exactly at 9 years old from a specific list of rulers you have, please provide their names for a more exact match.