Early history

The earliest reference to the name in England is  William Cass in the Essex county pipe rolls in 1200. Other recordings include Elyzabeth Casye, who married William Kendricke at St Dionis Backchurch, London, on August 27th 1564, whilst John Cass of Dalkeith, Scotland was summoned before the Privy Council for Scotland in 1566. The first recorded spelling of the family name is shown to be that of Roger Cass,which was dated 1130, in the Registrum de Dunfermelyn, during the reign of King David 1st of Scotland”, 1124 – 1153.


It is unknown when the Casses first arrived in Ireland but the earliest recording of the name can be found in the Calendar of Ormond Deeds Vol 1.1172-1350, Vol 2. 1350-1413. These records have been digitalised and can be found on  the Irish Manuscript Commission website

Henry Schenegord grants to Adam le Leye, burgess of Kilkenny, and his heirs in fee, eight acres in Corbali, two of which fie together in the moor between the land of William Casse and the land of Nicholas Brabezun ; and six acres lie in four places in the field that lies between the mansion that was Walter Cor’s, and the land that was Nicholas Brabecun’s ; paying yearly two shillings silver, saving to grantor and his heirs said rent and to Sir William Grasse and his heirs suit of their mill. {circa 1277}

 William Cass quit-claims to Thomas de Lega, the elder, and his heirs fifteen acres in the tenement of Corbali Kylnahc which he bought of John Cass his son. Consideration fourteen marks  {circa 1277}

 John Casse, son of William Casse, quit claims to Thomas de Lefa, the elder, burgess of Kilkenny, and his heirs fifteen acres in Corbali Kylnahc {circa 1277)

William Casse grants to Lord James le Botiller, Earl of Ormond, all messuages, lands, rents, services and tenements both in lordships and in demesnes which he had in Crossedermore in the tenement of Cloghyr.To have and to hold to the said James and his heirs in fee and heritage for ever. {February,1337}

Nicolas Casse :  Court grants mercy for not showing up after being summoned {1359}

Nicolas Casse:in Thurles, awarded 20d.(pennies) from Thomas Brit for not keeping his pledge.{1375)

William son of Nicolas Casse in Clonmel, forfeited 12d.(1375)

Walter Casse : in Clonmel, listed as participating lawyer in that day’s hearings {about 1400}

William Casse:  Witnesses deeds and grants {1402}

William Casse of Thurles, forfeited 12d

Will (in English) of Laurence Casse of Dublin. {March 13 1575}


One of our earliest surviving record sources is the so-called fiants of the reign of Elizabeth the First’ The originals were lost in the Four Courts Fire in 1922 but they have been indexed and published. These were warrants to the Court of Chancery in Ireland, which was the authority for the issue of letters patents under the Great Seal. They dealt with matters ranging from appointments to high office and important government activities, to grants of pardons to the humblest of the native Irish. There are a few individuals called Casse mentioned in the Fiants.

No 1865. Pardon granted to Thomas Casse in 1571

No. 2061.Pardons granted to James and John Cass in 1571

No. 2424, Pardon granted Tho. Casse in 1572

No. 6765. Pardon granted to Rob Casse in 1602.