- Burke indicates that this family originated in Staffordshire and descend from John Congreve, resident in county Cork in the seventeenth century. Sadleir refers to John Congreve who was High Sheriff of Waterford in 1755 and married Mary, daughter of Beverley Ussher of Kilmeaden. Ambrose Congreve, of Mount Congreve, owned over 1900 acres in county Waterford in the 1870s, as well as over 2000 acres in county Kilkenny. The Mount Congreve estate is still extant and owned by the Congreve family. John Congreve was among the principal lessors in the parishes of Dysert, barony of Upperthird, and Kilburne and Lisnakill, barony of Middlethird, county Waterford, at the time of Griffith's Valuation.