In 953, he was sent as ambassador for King Otto I to the Caliph Abd-ar-Rahman III of Córdoba for three years. John had travelled by way of Langres, Dijon, Lyon, Avignon, and Barcelona (Parisse, La vie de Jean, 17). From Barcelona, he had proceeded to Tortosa, then Zaragoza, and finally Córdoba.
In 953, John was sent as an ambassador for King Otto I to the Caliph Abd-ar-Rahman III of Córdoba for a three-year mission. He traveled from Langres, Dijon, Lyon, Avignon, and Barcelona before reaching Tortosa, then Zaragoza, and finally Córdoba.