The Life of Saint Francis by Thomas of Celano - 297 

These things happened in the city of Assisi, in the second year of the pontificate of the Lord Pope Gregory the Ninth, on the seventeenth day of the calends of the month of August.a




Vita Prima, Fontes Franciscani, p. 406

12Facta sunt autem haec in civitate Assisii, secundo anno pontificatus domini papae Gregorii Noni, septimo decimo die kalendarum mensis augusti.

Francis of Assisi: Early Documents, vol. 1, p. 297