Editors. "Ferdinand I signs a treaty giving power to his son-in-law Philip of Burgundy". The Literary Encyclopedia. First published 01 November 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=14114, accessed 13 December 2013.]
Philip the Handsome of Burgundy meets with the Cortes of Castile at Valladolid, who recognise him as king by virtue of his marriage to Ferdinand's daughter Juana. As a result, Ferdinand I gives way to his demands to rule Castile, and signs a treaty with him, but relations are hostile.