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Douglas Harper's Etymology Dictionary
Petrarchan

1827 (Keats uses Petrarchal, 1818), from Francesco Petrarch (Italian Petrarca) the poet (1304-1374).

Wikipedia

Usage examples of "petrarchan".

It also represents, as Belli tells Cardinal Fabiani, the octave of the rhyme scheme of a petrarchan sonnet.

The fourth was a perfectly good Petrarchan sonnet reviling the current administration and the party of which Len was an assenting member.