Sculpture of Grutte Pier
On the keystone on sides of the bridge over the Grootzand you can see a sculpture of Grutte Pier. After years of fighting for the freedom of Friesland, he went to live at Grootzand 12 in Sneek, where he also died.
wikipedia: Pier Gerlofs Donia, Grote Pier (Frisian: Grutte Pier) (Kimswerd, c. 1480 - Sneek, Oct. 28, 1520)Frisian warlord, freedom fighter and folk hero