Aruz wezni, or aruz prosody, is a kind of Turkic poetic rhythm. The earliest founder of this versification system was Khalil ibn Akhmad, who used the ancient name of his hometown "Aruz" to name it. There were 16 kinds of modalities of aruz at first. Later Persian scholars added 3 kinds. For example, the Turki long poem Happiness and Wisdom from the 11th century was written using a modality called "Mutaqallip".