| Sir Thomas Larcom | |
| Honorific Suffix: | PC FRS |
| Order: | 1st |
| Office: | Larcom baronetsBaronet |
| Term Start: | 1868 |
| Term End: | 1879 |
| Office1: | Under-Secretary for Ireland |
| Term Start1: | 1853 |
| Term End1: | 1868 |
| Birth Date: | 22 April 1801 |
| Birth Place: | Gosport, Hampshire |
| Death Date: | 15 June 1879 |
| Death Place: | Hampshire |
| Children: | 5 |
| Spouse: | Georgina D'Aguilar |
Major-General Sir Thomas Aiskew Larcom, Bart, PC FRS (22 April 1801 – 15 June 1879)[1] [2] was a leading official in the early Irish Ordnance Survey. He later became a poor law commissioner, census commissioner and finally executive head of the British administration in Ireland as under-secretary to the Lord-Lieutenant of Ireland, a position the government of the day was eager for him to take.
Born in Gosport, Hampshire, Larcom received his education at the Royal Military Academy and was commissioned in the Royal Engineers in 1820. He began his career with the Ordnance Survey of England in 1824 before being transferred to Ireland. With the rank of lieutenant he led the day-to-day operations of Survey headquarters by 1828 under Lt-Colonel Thomas Colby and established a meteorological observatory in Dublin. At the completion of the Survey's six-inch maps in 1846, Larcom joined the Irish Board of Works.[3] In this role he was involved in the establishment of the Queen's University of Ireland.[2]
The longest-serving under-secretary (1853–1868), Larcom had a distinguished career in his adopted country and acted with an impartiality that won him respect from all parties. In 1868 he was admitted to the Irish Privy Council and created a baronet.[2]
| Escutcheon: | Argent on a mount a hawthorn bush Proper and in chief an eagle displayed Gules. |
| Crest: | On a cap of maintenance Azure turned up Ermine a martlet Sable with a fleur-de-lis in its beak Or. |
| Motto: | Le Roy La Loy[4] |