In Forbidden City: China's Imperial Palace, readers will meet the ambitious Black Dragon, Yung Lo, who fearlessly fought his 22 rival brothers to become China's emperor in 1402. To display his power, Yung Lo began work on a walled city in Beijing. More than 200,000 slaves worked nearly 20 years to complete this imperial city of ornately decorated palaces, towers, schoolrooms, theaters, and gardens that could house 10,000 people.