The attraction of a life free from persecution in the New World led to a gradual Dutch Quaker migration. English Quakers in Rotterdam were permitted to transport people and cargo by ship to English colonies without restriction and throughout the 18th century many Dutch Quakers emigrated to Pennsylvania. There were an estimated 500 Quaker families in Amsterdam in 1710, but by 1797 there were only seven Quakers left in the city. Isabella Maria Gouda (1745–1832), a granddaughter of Jan Claus, took care of the meeting house on Keizersgracht, but was evicted shortly afterwards.