Tokugawa Ieyasu

was a Japanese shogun of the Edo period. His ruled started in 1603 and ended in 1605. He is one of the most famous military commanders in Japan.
Early life.
At birth, his name was Matsudaira Takechiyo. 
In 1562, he changed his name to Matsudaira Motoyasu. The second syllable -- "-yasu" -- comes from the name of his grandfather Kiyoyasu. A few months later, he changed his first name to the one by which he is known today. The first syllable -- " Ie-" -- comes from the last part of the name of Minamoto Yoshile, who was a famous ancestor. He received permission from the emperor to change his family name from Matsudaira to Tokugawa.
Shogun.
Ieyasu was the first shogun of the Tokugawa shogunate.