I too have an Isaac Matchett on my family tree. He was born about 1790 in Aghalee, County Antrim and married a lady called Sophia. They had a daughter, Deborah b. 31 January 1819. Deborah married my great great grandfather Frazer. I'm not entirely sure where Aghalee is even though I was born in Northern Ireland and lived there for some years. Perhaps Robert Matchett who responded to your messages can tell us if it's anywhere near Lisburn. Joan Glickler.