The firm was founded in 1865 by two young Norwegians, Theodor Wiese and Dankert Krohn. Over the following century and a half the firm built up an outstanding reputation for its old cask-aged Ports, in particular its ‘colheitas’ or single harvest tawnies. Krohn is also noted for its finely-constituted Vintage Ports sourced from top properties in the Cima Corgo area, including Krohn’s own estate of Quinta do Retiro Novo in the Rio Torto valley. In this area the nature of the soil where the vines are growing, the altitude, the locality, the (low) productivity and the slope of the vineyards are particularly favourable to the production of quality Ports.