Yoido Full Gospel Church on Yeouido island in Seoul was founded in 1958 by David Yonggi Cho and Choi Ja-shil and grew into the largest single congregation in the world by registered membership. It is Pentecostal and affiliated with the Assemblies of God. Its structure of small home cell groups, adopted early, was widely copied by other large churches. Membership figures have been reported at several hundred thousand and have fallen from their peak.