masayasu is perhaps best known to history for assassinating his distant cousin, the "tairō" hotta masatoshi (masatoshi’s grandmother was daughter of inaba masanori which made masatoshi was masayas’s first cousin once removed) inside edo castle in 1684. masayasu's motives remain unknown; but the absence of severe adverse repercussions for his family leaves open the supposition that the shōgun himself was privy to a planned assassination.