Bernat Guillermo was bishop of Urgell in Northern Spain from 1072 to 1092. Diocese of Urgell, GCatholic.com.Miscel·lània en homenatge a Joan Ainaud de Lasarte, Volum 2 Portada(L'Abadia de Montserrat, 1998) page 81.Per Prim Bertran, Francesca Español, Francesc Fité, Gener Gonzalvo, Flocel Sabaté, Max Turull, El comtat d'Urgell, Volum 1 page 74. He was Appointed Bishop of Urgell, in Rome on 15 Jan 1076,Episcopologio Español, Volume 1,500, Page 287, Number 15Le Petit Episcopologe, Issue 115, Number 10,155 by Pope Gregory VII, succeeding Bishop Guillem Guifredo. Very little is known of the details of his episcopate.
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