Thomas of Celano

Thomas of Celano was born at Celano in the Abruzzi, and joined St. Francis of Assisi c. 1214. He was commissioned by Gregory IX to write the life of St. Francis: the First Legend, 1229; the Second Legend, 1247; and the Tract on the Miracle of St. Francis a few years later. His Legend of St. Clare was composed in 1255. He was probably among the first band of friars to visit Germany, 1221.
--The Hymnal 1940 Companion
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Thomas of Celano. It is somewhat remarkable that neither the date of the birth nor of the death of this writer, whose name is so intimately associated with the Dies Irae, is on record. He was a native of Celano, a small town near the lake Fucino, in the farther Abruzzo, and hence his name of Thomas of Celano. Several of the inhabitants of this town were driven therefrom by Frederick II. in 1223, and Thomas with the rest. He found his way to Assisi, and became a monk there during the lifetime of St. Francis. The Franciscan Order was established in 1208, Thomas was therefore one of the early students at Assisi. He was subsequently "custos of the convents of Worms, Mentz, and Cologne, and afterwards sole custos of the Rhine districts." The last named appointment he held till 1230, when he returned to Assisi. As intimated above the date of his death is not on record. It is sometimes given as 1255. Thomas also wrote a Life of St. Francis.

--John Julian, Dictionary of Hymnology, Appendix I (1907)

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