Yishiha
1409–1451 ) was a Jurchen eunuch in the service of the Ming dynasty emperors who carried out several expeditions down the Songhua and Amur Rivers during the period of Ming rule of Manchuria , and is credited with the construction of the only two Ming dynasty Buddhist temples ever built on the territory of present-day Russia . 
<triplet> Songhua <subj> Amur River <obj> mouth of the watercourse <triplet> Amur River <subj> Songhua <obj> tributary