Johan Albrecht Ehrenström

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Johan Albrecht Ehrenström (1762 - 1847) was a Finnish architect and chairman of the committee in charge of rebuilding the city of Helsinki after a fire that destroyed many of its old wooden structures in 1808.

In contrast to the old medieval-style city plan with narrow and winding alleys, Ehrenström's vision for Helsinki was one of wide streets placed on a geometric grid in the fashion of the cities of ancient Greece. This plan was eventually approved by Tsar Alexander I of Russia, Grand Duke of Finland, and the city redesigned, led by German architect Carl Ludvig Engel.

After the city of Oulu was devastated by fire in 1822, Ehrenström was tasked with drawing a new plan for it. This was finished in 1824 and ratified by the tsar the following year.