Usage History of 'heptarch'

The following chart shows how frequently 'heptarch' appeared in printed materials over time. For example, the word 'heptarch' occurred 2 times in books in 1763 and 3 times in 2008. From 1763 to 2008, the word 'heptarch' was used a total of 484 times in books scanned by Google. See Reference: Google Ngram project.

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