Learn how to say Leonine correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word Leonine:
1relating to any of the popes named Leo, in particular denoting the part of Rome fortified by Leo IV (d.855).
2 Prosody (of medieval Latin verse) in hexameter or elegiac metre with internal rhyme.
(of English verse) with internal rhyme.
late Middle English: from the name Leo, from Latin leo ‘lion’. sense 2 of the adjective may be from the name of a medieval poet, but his identity is not known: