If you can identify the landlord of your ancestor in Ulster, you can start searching for estate records, which can include leases and rent rolls dating back to the 18th century.
Leases, which are much more prevalent for Ulster tenants, can often name several family members, including children who were cited as the ‘lives of the lease’. Rent rolls can demonstrate the continued occupancy of a property from the late 18th century and when property passed from one family member to another.
Estate records can be found in a variety of locations, depending on the ancestral seat of the landlord. The best place to start are the catalogues for PRONI ( www. proni.gov.uk/index/search_the_ archives/ecatalogue.htm), the National Library of Ireland ( sources.nli.ie) and the Landed Estates Database ( landedestates. ie) all of which can be searched by surname and placename.
Always remember to search under the title of the landlord, such as Earl of Moira, as well as the family name.