In 1848 rioting in Berlin forced the Prussian king to do what?

In 1848, rioting in Berlin during the widespread revolutions across Europe compelled the Prussian king, Frederick William IV, to promise reforms and convene a national assembly. This response was part of a broader wave of revolutionary fervor, where demands for constitutional governance and civil liberties were on the rise. However, the king later retracted his promises, leading to further unrest and the eventual failure of the revolution in Prussia.