This examination of the Tyrrell-Terrell clan stretches back to the Middle Ages, finding and explaining references to ancestors who resided in Europe several centuries ago. Although brief, this book's contents are the result of deep researches into archival data undertaken at the beginning of the 20th century. The enquiry resulted in the discovery of the family founder, who was connected with the Counts of the Vexin - a group of nobles who ruled lands in a time predating the Norman Conquest of England in the 11th century. From here, we are taken through the various manifestations of Tyrrell/Terrell ancestors, often recorded under a variety of different spellings due to inconsistent records keeping of the distant past. Later in the enquiry, we see various Tyrrell family members appear as émigrés in colonial North America, with records found in the archives of both New York and Boston. Mentions of notable family members and their progeny also appear, that readers can trace the lineages over the centuries. Descendants as well as genealogy enthusiasts will find this research illuminating, both in the sense of what was uncovered, as well as the limitations present in sources from long ago.