Porvoo received its town charter in 1346, making it Finland's second-oldest city, yet its riverside district predates that document by at least a century. The cluster of red ochre shore houses lining the Porvoo River served as merchant granaries and tar storage in the fifteenth century, their vivid pigment a mark of prosperity and a navigational beacon for Swedish and Hanseatic traders. Today those same timber warehouses anchor the Old Town's eastern edge, their reflections rippling in water that once carried butter, timber, and iron south to Tallinn and Stockholm. The Porvoo Cathedral, completed in the late fourteenth century and rebuilt after a 2006 arson fire, occupies the district's highest terrace. Tsar Alexander I convened the first Diet of Finland inside its stone nave in 1809, granting the Grand Duchy autonomy within the Russian Empire and elevating Porvoo to a symbol of Finnish constitutional identity. The cathedral's whitewashed interior and sparse wooden pews preserve the aesthetic of medieval Scandinavian Lutheranism, stripped of ornament but weighted with civic memory. A narrow staircase in the south transept climbs to the bell tower, where four bronze bells cast in 1762 still mark the hour over the Porvoo estuary. The Old Town's street grid follows the medieval pattern: Välikatu and Kirkkorinne ascend the hill in steep switchbacks, their granite cobbles worn concave by four centuries of cart traffic. Artisan workshops now occupy the eighteenth-century burgher houses that line these lanes, their ground floors converted to galleries selling Finnish ceramics, linens, and hand-bound journals. The painter Albert Edelfelt maintained a studio on Välikatu in the 1880s, and the poet Johan Ludvig Runeberg lived at Aleksanterinkatu 3 from 1852 until his death in 1877; his home is preserved as a house museum, its parlor and study arranged as they were when he composed the Finnish national anthem's lyrics. The Old Town's architectural coherence owes much to strict building codes enacted after the 1760 fire, which mandated timber construction on stone foundations and uniform roof pitches, giving Porvoo its signature silhouette of gabled rooflines stepping up the hillside toward the cathedral's white tower.