In 1610, Hals became a member of the Haarlem Guild of Saint Luke, and he started to earn money as an art restorer for the city council. He worked on their large art collection that Karel van Mander had described in his "Schilderboeck" ("Painter's Book") published in Haarlem in 1604. The most notable of these were the works of Geertgen tot Sint Jans, Jan van Scorel, and Jan Mostaert that hung in the St John's Church in Haarlem. The restoration work was paid for by the city of Haarlem, since all Catholic religious art had been confiscated after the satisfactie van Haarlem had been reversed in 1578, which had formerly given Catholics equal rights to Protestants. However, the entire collection of paintings was not formally possessed by the city council until 1625, after the city fathers had decided which paintings were suitable for the city hall. The remaining art that was considered too "Roman Catholic" was sold to Cornelis Claesz van Wieringen, a fellow guild member, on the condition that he remove it from the city. It was in this cultural context that Hals began his career in portraiture, since the market had disappeared for religious themes.