One of my favorite poets is Gerard Manley Hopkins (1844-1889), born in England. His sprung rhythm involved emphasis on accented syllables, not syllable counts as in metered poetry. His poetry was not published in his lifetime.
The Wreck of the Deutschland
Thou mastering me
God! giver of breath and bread;
World’s strand, sway of the sea;
Lord of living and dead…
C. T. Suddeth 
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