Okay. The "King" took over the land, but he wasn't the rightful heir to the throne, for it was the Fool who was the heir. The "King" either butchered, took advantage of the status by some means, or through other methods. The King wasn't aware of that the Fool was the rightful heir; thus, he may have forgotten over the years, the Fool survived and remained hidden, or he was young for the King to even recognize. Now, in the poem, the Fool kills the "King," and thus the reason in one sentence he mentions, "One to befit such a king...A kingdom as vast as the countryside," then a slight pause. The Fool whispered two sentences, "A fool's dream befitting one such as thee, For mocking the fool that had the right to rule..." The Fool gives the "King" insight who he is before he finally dies and the kingdom the "King" spoke of was heaven, another references to the death of the "King."