 Complete the following phrase:  In 1504, he was appointed bishop of Płock by Alexander Jagiellon, King of Poland 1501-1506. At the lords disposition he twice was sent to Rome to speak to Pope Julius II. In 1518 he was sent by King Sigismund I to the Diet of Augsburg to solicit aid against the Ottoman Turks, and subsequently to Rome to seek the mediation of Pope Leo X regarding the 