Look online it will give you the answers
The most common are 1st and 3rd person. 1st person is when you tell a story from your point of view, using the pronouns "I or we." And 3rd person is from an outside point of view, using the pronouns "he, she, and they." 2nd person isn't very common because it uses the pronoun "you," and makes the audience a character in the story. Hope this helps!
The speaker is most likely going to be the author, as the usage of "I" is constant in the poem.
Therefore the author William Wordsworth is most likely your answer
hope this helps
When the soldier from the battle comes in and informs the king about how Macbeth decapitated Macdonwald and put his head upon a pike