The earliest houses in Philadelphia were built with logs, with the new English settlers being taught how to build log homes by the Swedish settlers already living in the area. Early inhabitants had also dug out caves on the Delaware riverbank which were reportedly places of "clandestine looseness". The Philadelphia settlers soon began constructing buildings with wood and brick with the first brick house being built in 1684. By 1690 four brickmakers and ten bricklayers were working in the city. In 1698 construction of the Gloria Dei (Old Swedes') Church, the oldest surviving building in Philadelphia, began. Construction of the church was completed in 1700. Philadelphia was founded by Quakers and as a result many early buildings were plain and simple, the largest building being the Great Meeting House.