 Complete the following phrase:  The infamous poisoner Gesche Gottfried was executed in 1831 at the south end of the Domshof, near the cathedral, before a crowd of 35,000. A spitting stone in unworked basalt with an engraved cross serves as a memorial to this, the last public execution in Bremen. Other assemblies and marches took place in the square in 1848 when volunteers came to join the 