Tokugawa Hidetada was born to
Tokugawa Ieyasu and the
Lady Saigō on May 2, 1579. This was shortly before
Lady Tsukiyama, Ieyasu's official wife, and their son
Tokugawa Nobuyasu were executed on suspicion of plotting to assassinate
Oda Nobunaga, who was Nobuyasu's father-in-law and Ieyasu's ally. By killing his wife and son, Ieyasu declared his loyalty to Nobunaga. In 1589, Hidetada's mother fell ill, her health rapidly deteriorated, and she died at
Sunpu Castle. Later Hidetada with his brother, Matsudaira Tadayoshi, was raised by
Lady Acha, one of Ieyasu's concubines. His childhood name was , later becoming . The traditional power base of the Tokugawa clan was
Mikawa. In 1590, the new ruler of Japan,
Toyotomi Hideyoshi enlisted Tokugawa Ieyasu and others in attacking the domain of the
Hōjō in what became known as the
Siege of Odawara (1590). Hideyoshi enlisted Ieyasu for this campaign by promising to exchange the five provinces under Ieyasu's control for the eight
Kantō provinces, including the city of
Edo. In order to keep Ieyasu from defecting to the Hōjō side (since the Hōjō and the Tokugawa were formerly on friendly terms), Hideyoshi took the eleven-year-old Hidetada as a hostage. In 1592 Hideyoshi presided over Hidetada's coming of age ceremony; it was then that Ieyasu's son dropped his childhood name, Takechiyo (竹千代), and assumed the name Hidetada. He was named the
heir of the Tokugawa family, being the eldest surviving son of Ieyasu, and his favorite (since Ieyasu's eldest son had been previously executed, and his second son was adopted by Hideyoshi while still an infant). In 1593, Hidetada returned to his father's side. In 1590, Hidetada married
O-Hime (1585–1591), daughter of
Oda Nobukatsu and adopted daughter of
Toyotomi Hideyoshi. O-Hime died in 1591, and was given the
posthumous Buddhist name Shunshoin. In 1595, Hidetada married
Oeyo, daughter of
Azai Nagamasa and adopted daughter of
Toyotomi Hideyoshi. Their wedding was held in
Fushimi Castle. ==Military achievements (1593–1605)==