Sadataka was in so deep acquaintance with Muneyuki HAMURO that Muneyuki granted his position of Jushiinoge (Junior Fourth Rank, Lower Grade) to Sadataka, but the two parted ways as Sadataka, together with his older brother Nagafusa, opposed to the Retired Emperor Gotoba raising an army in the occasion of Jokyu War.
葉室宗行から従四位下を譲られる程、親しかったが、承久の乱においては定高は兄・長房とともに後鳥羽上皇の挙兵に反対する立場に回り、宗行と運命を分けた。