He acted as papal legate in France, attempting to broker a peace with the English. In 1356 he was there with Hélie de Talleyrand-Périgord, just ahead of the battle of Poitiers. He quarreled with Talleyrand, later that year, and operated independently from Paris. He was in England in June 1357, back again with Talleyrand. By mid-1358 the legates and Pope Innocent VI had despaired of an effective treaty: the complete failure of the longest papal peacemaking mission of the fourteenth century.
- Niccola Capocci, Niccolo Capocci, Niccolò dei Capocci, Nicolò Capocci, Niccolà di Capoccia, Nicolas Capucci, Nicholas de Caputio.
- From 1350, with the title of San Vitale ; from 1361 as bishop of Frascati.
- Key to Umbria: City Walks - Sapienza Vecchia
-  for a list including him;, in Dutch, referred to as Nicolaas de Caputio.
- , ,
- Jonathan Sumption, The Hundred Years War II (1999), p. 231.
- Sumption, p. 263.
- Sumption, p. 290.
- Sumption, p. 374.
- Sumption, p. 385.
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