[3][4] The name of Jacques de Taxi appears for the first time as a knight of the Order of St. John of Jerusalem at Acre in 1266.
In June 1272, Charles confirmed to de Taxi that the Hospitallers had the right to graze and water their horses on Crown lands and to collect wood, exempting them from taxes.
Jacques de Taxi received the surrender of the castle of Reggio Calabria from the hands of the partisans of Conradin.
In September 1272, Charles I of Anjou formed an embassy composed of the jurist Robert l'Enfant, Matteo de Riso of Messina and Nicolò de Ebdemonia of Palermo in order to intervene with Muhammad I al-Mustansir, the sultan of Tunis and a vassal of the Kingdom of Sicily, to collect the tribute that the sultan owed .
Charles asked de Taxi to come and join him in Foggia to discuss the latest news from the Holy Land.
Jacques de Taxi regularly intervened with Charles I of Anjou to obtain authorization to transfer from Sicily relief to the Holy Land and to provide all the products and equipment that the Hospitallers needed there.