subsequent periods, there was a steep price gradient for more fashionable artists. Those without a strong contemporary reputation, or who had fallen out of fashion, including many now considered among the greatest of the period, such as Vermeer, Frans Hals and Rembrandt in his last years, had considerable problems earning a living, and died poor; many artists had other jobs, or abandoned art entirely. In particular the French invasion of 1672 (the Rampjaar, or "year of disaster"), brought a severe depression to the art market, which never quite returned to earlier heights. The distribution of pictures was very wide: "yea many tymes, blacksmithes, cobblers etts., will have some picture or other by their Forge and in their stalle. Such is the generall Notion, enclination and delight that these Countrie Native have to Painting" reported an English traveller in 1640. There were for virtually the first time many professional art dealers, several also significant artists, like Vermeer and his father, Jan van Goyen and Willem Kalf. Rembrandt's dealer Hendrick van Uylenburgh and his son Gerrit were among the most important. Landscapes were the easiest uncommissioned works to sell, and their painters were the "common footmen in the Army of Art" according to Samuel van Hoogstraten. The technical quality of Dutch artists was generally high, still mostly following the old medieval system of training by apprenticeship with a master. Typically workshops were smaller than in Flanders or Italy, with only one or two apprentices at a time, the number often being restricted by guild regulations. The turmoil of the early years of the Republic, with displaced artists from the south moving north and the loss of traditional markets in the court and church, led to a resurgence of artists guilds, often still called the Guild of Saint Luke. In many cases these involved the artists extricating themselves from medieval groupings where they shared a guild with several other trades, such as housepainting. Several new guilds were established in the period: Amsterdam in 1579, Haarlem in 1590, and Gouda, Rotterdam, Utrecht and Delft between 1609 and 1611. The Leiden authorities distrusted guilds and did not allow one until 1648. Later in the century it began to become clear to all involved that the old idea of a guild controlling both training and sales no longer worked well, and gradually the guilds were replaced with academies, often only concerned with the training of artists.