According to "Kennaiki," since Toshihiro's alleged father, the then deputy governor Satohiro, embezzled tax money from temples, shrines and honjo (manors) and ran away in 1441, Hisahiro (he may have been Toshihiro) replaced him as Owari no kuni shugodai (governor of Owari Province) in the next year (1442) or so.
嘉吉元年（1441年）、『建内記』によると父とされる先代郷広が寺社領・本所領を横領して、逐電したため、翌、嘉吉2年（1442年）頃には先代郷広に代わり、久広（敏広か？）が尾張国守護代となったとされる。