 Reformed leaders, especially Huldrych Zwingli and John Calvin, actively eliminated imagery from churches within the control of their followers, and regarded the great majority of religious images as idolatrous.Early Calvinists were even suspicious of portraits of clergy; Christopher Hales (soon to be one of the Marian exiles) tried to have portraits of six divines sent to him from Zurich, and felt it necessary to explain his motives in a letter of 1550