 While the true origins of the rhyme are unknown there are several theories . As is common with nursery rhyme <unk> , complicated metaphors are often said to exist within the lyrics of Jack and Jill . Most explanations post @-@ date the first publication of the rhyme and have no <unk> evidence . These include the suggestion by S. <unk> @-@ Gould in the 19th century that the events were a version of the story told in the 13th @-@ century <unk> <unk> <unk> written by Icelandic historian <unk> <unk> , who stated that in Norse mythology , <unk> and <unk> , brother and sister ( respectively ) , were taken up from the earth by the moon ( personified as the god <unk> ) as they were <unk> water from the well called <unk> , bearing on their shoulders the <unk> called <unk> and the pole called <unk> . Around 1835 John <unk> <unk> suggested that Jack and Jill were two priests , and this was enlarged by Katherine <unk> in 1930 to indicate that Jack represented Cardinal <unk> ( <unk> – 1530 ) ; and Jill was Bishop <unk> , who negotiated the marriage of Mary Tudor to the French king in 1514 . 
