The chapter on the ravī (the last ‘letter’ of rhyme), from work al-Muʿğam fī maʿāyīr ašʿār al-ʿağam by Šams-i Qays (13th century), is deemed earliest and more prestigious extant text describing rules concerning rhyme ( qāfiya ) in Persian verses. It focuses identification pivotal rhyming letter ), that segment word, around which a poem built. In discussing this topic, touches linguistic issues ...