Though not personally interested in religious reform, Francis I (reigned 1515–1547) initially maintained an attitude of tolerance, in accordance with his interest in the humanist movement. This changed in 1534 with the Affair of the Placards. In this act, Protestants denounced the Catholic Mass in placards that appeared across France, even reaching the royal apartments. During this time as the issue of religious faith entered into the arena of politics, Francis came to view the movement as a threat to the kingdom's stability.