The "waqf" in Islamic law, which developed in the medieval Islamic world from the 7th to 9th centuries, bears a notable resemblance to the English trust law. Every "waqf" was required to have a "waqif" (founder), "mutawillis" (trustee), "qadi" (judge) and beneficiaries. Under both a "waqf" and a trust, "property is reserved, and its usufruct appropriated, for the benefit of specific individuals, or for a general charitable purpose; the corpus becomes inalienable; estates for life in favor of successive beneficiaries can be created" and "without regard to the law of inheritance or the rights of the heirs; and continuity is secured by the successive appointment of trustees or "mutawillis"."