https://zenit.org/2014/07/05/pope-st-celestine-v-and-st-francis-great-teachers-of-god-s-mercy-and-forgiveness/
Pope St. Celestine V and St. Francis: Great Teachers of God's Mercy and Forgiveness - ZENIT -...
Jul 5, 2014 - Pope Francis Recalls the Saints' Example During Opening of Celestine Jubilee Year
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https://www.catholic.org/encyclopedia/view.php?id=2723
Pope St. Celestine V - Encyclopedia Volume - Catholic Encyclopedia - Catholic Online
(PIETRO DI MURRONE.) Born 1215, in the Neapolitan province of Moline; elected at Perugia 5 July, 1294; consecrated and crowned at Aquila, 29 August; abdicated...
pope st celestineencyclopedia volumecatholiconline