You are (or were) a seventh-generation "Mormon" and yet do not know this? The angel's name was Moroni. (See the "Testimony of the Prophet Joseph Smith" in the Introduction to the Book of Mormon.)
Yes, I know...that is one rendition of the Joseph Smith story. I've posted others to you.
One of the blessings (for me) and dilemmas (for you), is that I possess early church publications. When the Church changes its official story, I have the proof. But you too can find it if you choose to look.