Note the monument to the daimyo Matsudaira Masatane, Ieyasu's trusted retainer.
Ieyasu was the name of Matsudaira Masatane's retainer.
mnli hypothesis: Ieyasu was the name of Matsudaira Masatane's retainer. premise: Note the monument to the daimyo Matsudaira Masatane, Ieyasu's trusted retainer.