St. John's Episcopal Church (official name, St. John's Church) is located at 61 Broad Street in the historic heart of Elizabeth, New Jersey, and part of the Episcopal Diocese of New Jersey headquartered in Trenton. It was founded by missionaries of the Society for the Propagation of the Gospel, London, England, in 1706. It is the marriage site of the parents of the first American Roman Catholic saint, Elizabeth Ann Seton, and underneath the current church which was erected in 1860 is the unmarked burial site of the youngest signer of the U.S. Constitution, US Senator Jonathan Dayton. For nearly 150 years both Anglicans/Episcopalians and Roman Catholics worshiped together at St. John's until the first Roman Catholic Church was established in Elizabeth in 1855, St. Mary of the Assumption Roman Catholic Church. However, the monthly Eucharist/Mass was always presided over by an Anglican/Episcopal vicar/rector/priest. St.