When Charles 1 refused to abide by the what he was executed?

Charles I railed against the curbs that Parliament endeavoured to place on him as the sitting monarch. He preferred to cling to the outdated concept that kings ruled by Divine Right. Thus, he could do whatever he wished and it would be right because according to the Rule of Divine Right, the king could do no wrong. He was answerable to no one. He could execute any citizen without trial; he could tax you until you bled, and as an ordinary citizen, your only right was to die and to pay the tax.

When Parliament attempted to reign him in, he dissolved Parliament. This brought about the subsequent war, and the rise of Oliver Cromwell who defeated the Royalists on the battlefield.

Charles was brought before Parliament to force him to accept the legitimacy of Parliament. But he was adamant in his belief of Rule by Divine Right. Therefore, Parliament had little choice but to decree his execution.

In an interesting side note, Richard Nixon, in an interview with David Frost, espoused somewhat the same idea when he said, "...it doesn't matter, if the President does it, it's not against the law."