Grimaldo de San Millán

Grimaldo de San Millán (Latin: Grimaldus Aemilianensis) or Grimaldo de Silos (Grimaldus Exiliensis) was a Benedictine monk and hagiographer active in the decades on either side of 1100.

Grimaldo was a monk of San Domingo de Silos and later San Millán de la Cogolla. Nothing is known of his life beyond what can be gleaned from his own works. He may have been one of the monks of San Millán who went into exile with Dominic of Silos around 1040 before the founding of San Domingo de Silos. Some historians have supposed that he was French.

While at Silos, Grimaldo wrote a biography of Dominic of Silos in three books, the Vita sancti Dominici Exiliensis. He wrote at the request of his abbot, Fortunio, Dominic's successor. It was originally composed in 1073–1076. It was revised between 1088 and the death of King Alfonso VI on 30 June 1109. Grimaldo was an eyewitness to much that he recounts. Sometime after 1095, Grimaldo retired from Silos to San Millán.

In 1090, the relics of Saint Felix of Bilibio were moved from the castle of Bilibio to San Millán. In 1109–1110, the abbot of San Millán, Blas, asked Grimaldo to write an account of the translation and of some miracles attributed to the saint. The resulting Translatio et miracula sancti Felicis presbyteri recounts eight miracles, seven that took place at San Millán and one at Bilibio. The miracles date to the period 1090–1098. The date of the work can be fixed rather precisely. It was completed between the death of Alfonso VI and the death or resignation of Blas as abbot, which took place before August 1110. The Translatio and the Miracula are two separate works in the Bibliotheca Hagiographica Latina (nos. 2861 and 2862; the Vita is no. 2238).