Masanori 's early service began under Hidetada in 1602 , and in 1604 he was assigned as an attendant to Ieyasu 's son Tokugawa Ieyasu .
Masanori 's early service began under Tokugawa Ieyasu in 1602 , and in 1604 he was assigned as an attendant to Ieyasu 's son Hidetada .