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Palla is described in contemporary documentation as a iuglar (cognate with "juggler", but signifying jongleur). He was at Alfonso's court at Burgos on 24 April 1136 and again at Toledo on 9 December 1151.
- Barton, Simon. The Aristocracy in Twelfth-Century León and Castile. Cambridge: Cambridge University Press, 1997. ISBN 0-521-49727-2.