Simon Mangan was a landowner and HM Lieutenant of Meath

Lord Lieutenant of Meath

This is a list of people who served as Lord Lieutenant of County Meath, Ireland. The office was created on 23 August 1831.* Edward Bligh, 5th Earl of Darnley 28 October 1831 – 11 February 1835...

 from 1894 to 1906. A JP

Justice of the Peace

A justice of the peace is a puisne judicial officer elected or appointed by means of a commission to keep the peace. Depending on the jurisdiction, they might dispense summary justice or merely deal with local administrative applications in common law jurisdictions...

, he was also in business with his son-in-law Patrick Leonard

Patrick Leonard (Irish politician)

Patrick Leonard was an Irish politician, businessman and landowner. He owned three farms near Dublin and was involved in moving cattle between the west of Ireland and Dublin. In 1915 he was elected President of the Dublin Chamber of Commerce...

 in moving cattle between the west and east of Ireland.

Mangan was the son of John Mangan (1788-1868) and Margaret (nee) Duffy (d 1843). He lived at Dunboyne Castle, which remained in his family until 1950, and married Margaret (nee) Larkin (1839-1921), a first cousin of Brig Paul Kenna VC

Victoria Cross

The Victoria Cross is the highest military decoration awarded for valour "in the face of the enemy" to members of the armed forces of various Commonwealth countries, and previous British Empire territories....

. Of his daughters, Minnie married the architect Ralph Byrne, Emily married Patrick Leonard and Kathleen married Cmdr Ralph Tindal-Carill-Worsley, RN.