Nicholas II (while still a prince/tsarevich), 2nd from left, with Prussian royal relatives, 1890s Posted on November 6, 2021 by Matthew 2 Share this: Click to share on Facebook (Opens in new window) Facebook Click to share on X (Opens in new window) X Like Loading... Related
MATTHEW'S ISLAND 
l-r: Prince Alfred of Coburg, Nicholas, Grand Duke Ernst of Hesse and Duke of Coburg
Thanks for the identifications! I’m not familiar with German/Prussian royalty.