1. Tokugawa Ietsugu was the son of Tokugawa Ienobu, thus making him the grandson of Tokugawa Tsunashige, daimyo of Kofu, great-grandson of Tokugawa Iemitsu, great-great grandson of Tokugawa Hidetada, and finally the great-great-great grandson of Tokugawa Ieyasu.
Tokugawa Ietsugu was born in 1709 in Edo, being the eldest son of shogun Tokugawa Ienobu and concubine, Gekkoin.
At the time Ietsugu was born, his father, Ienobu, was 48.
Tokugawa Ietsugu was only three years old when his father died, upon which he became shogun Ietsugu.
Tokugawa Ietsugu married Yoshiko no Miya, daughter of Emperor Reigen, in 1715; at that time he was only 4 years and Yoshiko no Miya was only one year old.
Tokugawa Ietsugu did not take much care of the country's matters; and his advisors, namely Arai Hakuseki, addressed them.
Tokugawa Ietsugu was 5 years old, she was 1 years old.
In Shotoku 6, on the 30th day of the 4th month, Shogun Tokugawa Ietsugu died of complications of a cold, at the age of six.
Since he had no children the direct descendant of Tokugawa Ietsugu Iemitsu came to an end.
Nonetheless, there were still collateral lineal branches descended from Ieyasu through one of his many children, and the new shogun, Tokugawa Ietsugu Yoshimune, was chosen from one of these lineal Tokugawa Ietsugu branches.
The years in which Tokugawa Ietsugu was shogun are more specifically identified by more than one era name or nengo.