I found your picture of the tombstone of Jane and Noble Armstrong when I was researching my family history. I found it when researching my great great grandmother Jane Armstrong who was born in Ireland on October, 11, 1829 and died in America August 11, 1876 after marrying Patrick Tighe. I think Jane Armstrong was the daughter of John Armstrong of Creagh and Margaret Morton and possibly the granddaughter of Noble Armstrong and Jane Bickerstaff.
I received most of this information from a letter written by Robert Armstrong who was born in the USA on February 27,1855 to his niece Catherine Krueger where he recalls people in America referring to his mother, Jane Armstrong Tighe, as "Lady Jane" because the tenants in her hometown of Longford, Ireland used to call her that. Does this sound like your family? And if so any information you have to share would be greatly appreciated. If you're more comfortable communicating by email my address is firstname.lastname@example.org