Memento Mori

Today, I was reading a poem for my 18th Century English class and I couldn't help but think of Horace. Thomas Gray's Elegy Written in a Country Church Yard is about the lamentation of the death of a friend and then goes into a more generalized mourning of death. While researching analysis on the poem, I came across a passage that said Gray was heavily influenced by the phrase "memento mori," remember you must die. I feel as if Horace could have been the godfather of this saying. I know the Classics were a heavy influence in the 18th Century, but its definitely interesting to see Latin and Classical influences in different works.