Did john butler live with indianchief red cloud and write a book called red cloud return to Ireland and live in glencar co Kerry he died in glencar and is buried in cloon lake on a small island?

I have recently visited Cloon Lake (near Glencar) in Kerry to look at a property that overlooks the island at the southern end of the lake. The owner of the property told me that John Butler is buried on the island. His family have owned the property for several generations. It is a beautiful spot, isolated and very tranquil.