Saadi Shirazi
The first change was the adoption of the "Takhallus", the practice of mentioning the poet's pen-name in the final couplet (called the maqta). The adoption of the "takhallus" became a gradually accepted part of the ghazal form, and by the time of Saadi Shirazi (1210–1291 AD), the most important ghazal poet of this period, it had become "de rigueur." The second marked change from Arabian ghazal form in Persian ghazals was a movement towards far greater autonomy between the couplets.