I'm wondering if he's the Aizu Myōchin Munechika? [Munechika of Aizu-clan]
会津明珍宗親
Aizu Myōchin Munechika
you can see in the last 2 kanji, middle line are your 宗親:
source
While searching around, there seems to have been at least two other Munechika -- confusingly, one with the prename Myōchin
(津山)明珍宗周 (Tsuyama Myōchin Munechika)
三条宗近 (Sanjo Munechika)
--Guy
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