""The Subject of All Verse: Being an Inquiry into the Authorship of a Famous Epitaph"" is a book written by Philip Sidney and originally published in 1907. The book is a detailed investigation into the authorship of a well-known epitaph, which has been attributed to various poets throughout history. Sidney examines the evidence and arguments for each claim, and ultimately comes to his own conclusion about who he believes is the true author of the...