Aruz wezni, or aruz prosody, is a kind of Turkic poetic rhythm. The earliest founder of this versification system was Khalil ibn Ahmad. There were 16 kinds of modalities of aruz at first. Later Persian scholars added 3 more kinds. For example, the Karakhanid long poem Kutadgu Bilig from the 11th century was written using a modality called "Mutaqallip".^[1]