Preparations then stalled because of the continued problems within the London Company, and competing Dutch companies approached the congregation with the possibility of settling in the Hudson River area. David Baeckelandt suggests that the Leiden group was approached by Englishman Matthew Slade, son-in-law of Petrus Placius, a cartographer for the Dutch East India Company. Slade was also a spy for the English Ambassador, and the Pilgrims' plans were therefore known both at court and among influential investors in the Virginia Company's colony at Jamestown. Negotiations were broken off with the Dutch, however, at the encouragement of English merchant Thomas Weston, who assured them that he could resolve the London Company delays. The London Company intended to claim the area explored by Hudson before the Dutch could become fully established, and the first Dutch settlers did not arrive in the area until 1624.