Nicholas Biddulph of Congor, county Tipperary, was the eldest son of Francis Biddulph of Mount Oliver, Queen's County (Laois), a junior branch of the Biddulphs of Rathrobin, Tullamore, county Offaly. In the 1870s he owned 1611 acres in King's County (Offaly) and 74 acres in county Tipperary.
- Pedigree of the Biddulph family of Rathrobin, Offaly, together with some notes relating to their estate 1903. Ms 5082 ; National Library of Ireland
Contemporary printed sources
- ''GRIFFITH'S VALUATION OF IRELAND'[Primary Valuation of Tenements]', 1850-1858. : Barony of Lower Ormond, 10 (Ballyrickard North)
- PARLIAMENTARY PAPERS. ''Return of owners of land of one acre and upwards, in the several counties .... in Ireland''. HC 1876, LXXX: 158
- ORDNANCE SURVEY NAME BOOKS, County Tipperary: Vol.I, Parish of Ardcroney, p.82.
- WALFORD, Edward. 'The County families of the United Kingdom''. London: Chatto & Windus, 1885): p.85
Modern printed sources
- BURKE, Sir Bernard. ''A genealogical and heraldic history of the Landed Gentry of Ireland''. London: Harrison & Sons, 1904: 36-37
- NATIONAL LIBRARY OF IRELAND. Reports on Private Collections: Report on the Biddulph Papers (from 1773), the property of Lieut. Col. A. T. S. Magan, Killyon House, Hill of Down, Co. Meath, relating to the Biddulph family and to lands in Cos. Leix and Offaly. Report No 149