横須賀藩
Tadanao entered the service of the Tokugawa administration in the spring of 1732, with his appointment to the offices of "Sōshaban" and "Jisha-bugyō". After two years in these positions, he was promoted to "wakadoshiyori". In 1745, his court rank was raised to junior 4th, lower grade ("ju shi i no ge" 従四位下), and his domain increased by 5,000 "koku" to 30,000 "koku". The following summer, he was made a "rōjū" in the service of "Shōgun" Tokugawa Ieshige, and served in the position until 1747. His domains were further expanded by another 5,000 "koku" in 1749, bringing Yokosuka Domain to 35,000 "koku" in size.