[1] Until the early 18th century, the corner where the two streets meet was the location for a well of considerable proportions.
They appointed the city architect Erik Palmstedt (1741-1803) to design the new square, its well and façades.
The Neoclassical ambitions of the Gustavian architect had to be restricted in the Medieval urban landscape, which resulted in the small-scale composition; the concave façade with its windows of various sizes acting as a scenic background for the well and its doric cast iron columns.
The first synagogue in Stockholm (see Aaron Isaac) was founded on the square's eastern side in the 19th century.
[1][2] The location of the well flanked by two chestnut trees, was once the site of the pharmacy Svanen ("The Swan"), which gave the block its Latin name Cygnus.