Following the Affair of the Placards, culprits were rounded up, at least a dozen heretics were put to death, and the persecution of Protestants increased. One of those who fled France at that time was John Calvin, who emigrated to Basel in 1535 before eventually settling in Geneva in 1536. Beyond the reach of the French kings in Geneva, Calvin continued to take an interest in the religious affairs of his native land including the training of ministers for congregations in France.