Ferdinand's sister Isabella of Portugal, Duchess of Burgundy, endowed a mass to be said in Brussels, and in 1467 decided to fund a chapel dedicated to Ferdinand the Holy Prince at the Church of St. Anthony in Lisbon. To this end, Isabella dispatched Frei João Álvares to Rome to petition the pope for religious honors for her brother, possibly even beatification, the first step to formal sainthood. At Álvares's request, bulls were issued by Pope Paul II in 1470 granting permission for the Lisbon chapel and indulgences to anyone who attended an anniversary mass for Ferdinand. Although a contract was signed between Álvares and Lisbon municipal authorities in November 1471 to begin the chapel, the death of both Paul II and Isabella around this time probably prevented the campaign from going forward, with the result that Ferdinand remained unbeatified and uncanonized.