This is a list (presently incomplete) of lawyers who held the rank of serjeant-at-law at the Irish Bar.
The first recorded serjeant was Roger Owen, who was appointed c.1261, although the name serjeant itself is not recorded in Ireland until 1388. In the early years of the office an appointment as serjeant might be temporary, or might cover only a part of the country.
In contrast to England, for many years there was only one Serjeant-at-Law in Ireland, who was known as the King’s Serjeant or simply Serjeant. In 1627 another was appointed, and they were known as the Prime Serjeant and Second Serjeant. In 1682 a Third Serjeant was appointed. In 1805 the Prime Serjeant became known as First Serjeant.
Until the nineteenth century at least the need for three serjeants was often questioned: it was pointed out that the office of Third Serjeant in particular was often left vacant for years. It has been stated that Third Serjeant was created simply as a consolation prize for Sir John Lyndon, the first holder of the office, who had been passed over as both a High Court judge and as Second Serjeant, and that no particular duties attached to the Third Serjeant. Certainly Sir Richard Ryves, the Recorder of Dublin, was able to combine that notoriously gruelling office with that of Third, and later Second Serjeant, which suggests that he was not greatly troubled with work in his role as Serjeant. Alan Brodrick, 1st Viscount Midleton, who was removed from his office as Third Serjeant in 1692, complained of his dismissal, but admitted that in his two years in the office he had had almost no work to do.
The position was extremely lucrative. Although in theory the salary in the 1690s was fixed at £30 a year, it was well known that in practice the various perquisites attached to the office brought it up to between £900 and £1000 a year, apart from the serjeant's right to continue to take fees from private clients.
The serjeants-at-law ranked ahead of the Attorney-General for Ireland and the Solicitor-General for Ireland until 1805, when the law officers took precedence. From about 1660 onwards they were expected to consult with the Attorney General, and were discouraged from acting on their own initiative: in 1692 the Prime Serjeant, John Osborne, was dismissed for repeatedly acting in opposition to Crown policy. From the 1560s on the serjeants acted as "messengers" to the Irish House of Commons i.e. they were summoned to advise the House on points of law, just as the High Court judges advised the Irish House of Lords. The role of messenger seems to have lapsed around 1740.