Is it true that until 1649 no king in Europe died on the chopping block? If not, what makes the death of Charles I remarkable?

Kings were executed before, for example, in the 13th century, Konradin, the heir of Frederick II Staufen, was executed. But this execution was carried out at the behest of another rival king – Charles of Anjou. In 1649, for the first time, King Charles I was executed by the verdict of the people’s deputies.