Sir Lucas Dillon, also called Luke, was a leading Irish barrister and judge of the Elizabethan era who held the offices of Attorney General for Ireland and Chief Baron of the Irish Exchequer. He supported the Lord Deputy Henry Sidney in the cess controversy and the Lord Deputy John Perrot in the Desmond Rebellions. He was held in high regard by Queen Elizabeth, but was accused by his enemies of corruption and maladministration.

The Attorney-General for Ireland was an Irish and then United Kingdom government office-holder. He was senior in rank to the Solicitor-General for Ireland: both advised the Crown on Irish legal matters. With the establishment of the Irish Free State in 1922, the duties of the Attorney-General and Solicitor-General for Ireland were taken over by the Attorney General of Ireland. The office of Solicitor-General for Ireland was abolished at the same time for reasons of economy. This led to repeated complaints from the first Attorney General of Ireland, Hugh Kennedy, about the "immense volume of work" which he was now forced to deal with single-handedly.