Possibly the swiftest route to your roots.
Irish genealogy website directory.
www.proni.gov.uk/index/search_the_archives/will_calendars.htm
Description:
This application provides a fully searchable index to the will calendar entries for the three District Probate Registries of Armagh, Belfast and Londonderry, with the facility to view the entire will calendar entry for each successful search. The database covers the period 1858-1919 and 1922-1943. Part of 1921 has been added, with remaining entries for 1920-1921 to follow in the near future.