Source:Peter Clement Bartrum. Electronic Version of Welsh Genealogies AD 300-1500

The project is a digitization of Bartrum's Welsh Genealogies AD 300-1400 and Welsh Genealogies AD 1400-1500, aimed at ultimately creating a searchable database. The project is still ongoing as of 2013. All of the pedigree charts of the two works seem to have been scanned and available online. The searchable index of names is still in the future.

Pedigree charts are organized by the founders of lineages. For example, Cynwrig ab Owain, a direct male-line descendant of Tudor Trefor, is found with his siblings on the chart "Tudor Trefor 10". Entering "Tudor Trefor 10" in the search bar will take you to his chart. If you do not already know which chart he is on, some browsing of charts starting with "Tudur Trefor" may be required. Underlined names on a chart followed by a number are the titles of other charts with more information.