If I didn’t live in Arkansas and lived closer to NY, I’d be looking for the ring tomorrow. I couldn’t figure out “feather of three” or “Son”. I agree, “isle of many mounts”, is Manhattan. “To royal reflections And rebel roots”, refers to Columbia Univeristy. It was originally King’s college, founded by Royal charter, and renamed Columbia College after the Revolutionary War by the rebels. ”The place of pale leaves,” is a library at Columbia, Low Memorial Library. Out front is a statue of Alma Mater, which appears to have a grey patina. (Grey eyes watch over) “Where panic pauses To play a tune”, is a statue of the Great God of Pan, which is to the left side of Low Library as you face it. Pan is lying down relaxing and starting to play on his musical instrument. Pan was sculpted by George Grey Barnard. I took his name to hint at grey eyes earlier. ”Look low”, this could mean look down low or it’s a hint to Low Library. If I went, I would start at the Pan statue and search around it and between it and Low Library. You can google The Great God Pan sculpture, and see a photo. In the background is the side and part of the front of Low Library. Hope this helps someone.