[1] He appeared in 1676 in Dublin as "physician to the state and my lord-lieutenant" (according to Sir John Hill, quoted in Culloden Papers, London, 1865), and was elected one of the fourteen fellows of the Dublin College of Physicians in 1677.

[2] Dun accompanied King William III to the Battle of the Boyne.

[3] Dun was evidently a physician in Dublin and had great social influence.

He was the friend and medical adviser of Archbishop King (1650–1729), and of many other influential people.

[contradictory] In 1815 Sir Patrick Dun's Hospital was founded and named in his honour, by the College of Physicians, noted physicians William Stokes and of Robert James Graves served in the hospital.