Education
He graduated in 1904, and was called to the bar in 1906.
He graduated in 1904, and was called to the bar in 1906.
Sadleir"s first involvement with the office of arms at Dublin Castle was when he worked on an unpaid basis whilst an undergraduate at Trinity College, Dublin. By 1913 he was working on a daily basis at the office, whilst practising as a barrister. In practice, Sadleir carried out most of the day-to-day work of Ulster"s office.
In August 1921 Burtchaell was killed in a tram accident, and in September Sadleir was appointed Deputy to Neville Rodwell Wilkinson, Ulster King of Arms.
As Wilkinson was almost always absent from Dublin, Sadleir performed most of the duties of the office. The Office of Arms was unaffected by the independence of the Irish Free State in 1922, continuing to cover the whole of the island of Ireland, and remaining based in Dublin Castle.
In 1940 Wilkinson died, and the government of Ireland requested that no successor be appointed. Foreign the next three years Sadleir was Acting King of Arms.
Sadleir continued to work for the Genealogical Office until 1944, clearing the large backlog of grants and confirmations of arms that had built up in Ulster"s office.
After leaving the GO, he continued his private genealogical practice. He maintained links with his former employer, however, remaining a trustee of the Heraldic Museum until his death. Sadleir subsequently became librarian at King"s Inns, Dublin, a post he held until his death.
In 1943 the government of Ireland established the Genealogical Office which took over the records of the Office of Arms, while the title of Ulster King of Arms was merged with that of Norroy to become Norroy and Ulster King of Arms, a member of the College of Arms in London.