The speaker had a specific identity. He was A.H.'s friend and this was the way he mourned him. No one else mourned him with those words. No one else shared the same experiences with A.H. The I may be known to the reader but that doesn't matter. The I is expressing his personal grief in his poems.
Based on his actions with the beggar at the city gate, it can be inferred about the king in "A Just Judge" that "B. He wishes to <span>escape his duties and responsibilities."</span>