Classical liberalism in Britain traces its roots to the Whigs and radicals, and was heavily influenced by French physiocracy. Whiggery had become a dominant ideology following the Glorious Revolution of 1688 and was associated with supporting the British Parliament, upholding the rule of law, and defending landed property. The origins of rights were seen as being in an ancient constitution, which had existed from time immemorial. These rights, which some Whigs considered to include freedom of the press and freedom of speech, were justified by custom rather than as natural rights. These Whigs believed that the power of the executive had to be constrained. While they supported limited suffrage, they saw voting as a privilege rather than as a right. However, there was no consistency in Whig ideology and diverse writers including John Locke, David Hume, Adam Smith and Edmund Burke were all influential among Whigs, although none of them were universally accepted.