Flavel was born in 1596 at Bishop's Lydeard, Somerset, England, where his father was a clergyman.
He matriculated on 25 January 1611 at Trinity College, Oxford, and developed a turn for logical disputation.
After Flavel's death, Alexander Huish of Wadham edited from his manuscript a logical treatise, with the title Tractatus de Demonstratione Methodicus et Polemicus, &c., Oxford, 1619.
Huish dedicated it (1 March 1619) to Arthur Lake, bishop of Bath and Wells.
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