[1][6] Prior to becoming bishop, Juan served as abbot of Santander and Valladolid.
[7] In 1231, he was appointed by Pope Gregory IX as Bishop of Osma.
[2] On 29 May 1240, was he appointed by Pope Gregory IX as Bishop of Burgos where served until his death on 1 Oct 1246.
[2] Juan was probably the author of the Latin Chronicle of the Kings of Castile, written between 1217 and 1239.
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